diff --git a/src/Tingle.Extensions.MongoDB/Extensions/IMongoQueryableExtensions.cs b/src/Tingle.Extensions.MongoDB/Extensions/IMongoQueryableExtensions.cs
index ef3facd..90dca13 100644
--- a/src/Tingle.Extensions.MongoDB/Extensions/IMongoQueryableExtensions.cs
+++ b/src/Tingle.Extensions.MongoDB/Extensions/IMongoQueryableExtensions.cs
@@ -1,5 +1,6 @@
 using MongoDB.Driver;
 using MongoDB.Driver.Linq;
+using System.Linq.Expressions;
 
 namespace System.Linq;
 
@@ -8,61 +9,221 @@ namespace System.Linq;
 /// </summary>
 public static class IMongoQueryableExtensions
 {
+    /// <summary>
+    /// Returns the number of elements in a sequence.
+    /// This method removes the need to convert instances of <see cref="IQueryable{T}"/> to <see cref="IMongoQueryable{T}"/>.
+    /// </summary>
+    /// <typeparam name="T">The type of the elements of source.</typeparam>
+    /// <param name="source">The <see cref="IMongoQueryable{T}"/> that contains the elements to be counted.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>The number of elements in the input sequence.</returns>
+    public static Task<long> LongCountInMongoAsync<T>(this IQueryable<T> source, CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(source);
+
+        // cast to IMongoQueryable<T>, if not possible, a type cast exception is thrown
+        var mq = (IMongoQueryable<T>)source;
+
+        // execute the async operation
+        return mq.LongCountAsync(cancellationToken);
+    }
+
+    /// <summary>
+    /// Returns the number of elements in the specified sequence that satisfies a condition.
+    /// This method removes the need to convert instances of <see cref="IQueryable{T}"/> to <see cref="IMongoQueryable{T}"/>.
+    /// </summary>
+    /// <typeparam name="T">The type of the elements of source.</typeparam>
+    /// <param name="source">The <see cref="IMongoQueryable{T}"/> that contains the elements to be counted.</param>
+    /// <param name="predicate">A function to test an element for a condition.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>The number of elements in the sequence that satisfies the condition in the predicate function.</returns>
+    public static Task<long> LongCountInMongoAsync<T>(this IQueryable<T> source, Expression<Func<T, bool>> predicate, CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(source);
+
+        // cast to IMongoQueryable<T>, if not possible, a type cast exception is thrown
+        var mq = (IMongoQueryable<T>)source;
+
+        // execute the async operation
+        return mq.LongCountAsync(predicate, cancellationToken);
+    }
+
     /// <summary>
     /// Returns a list containing all the documents returned from Mongo.
     /// This method removes the need to convert instances of <see cref="IQueryable{T}"/> to <see cref="IMongoQueryable{T}"/>.
     /// </summary>
-    /// <typeparam name="T"></typeparam>
-    /// <param name="query"></param>
-    /// <param name="cancellationToken"></param>
-    /// <returns></returns>
-    public static Task<List<T>> ToListInMongoAsync<T>(this IQueryable<T> query, CancellationToken cancellationToken = default)
+    /// <typeparam name="T">The type of the document.</typeparam>
+    /// <param name="source">An <see cref="IMongoQueryable{T}"/>.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>A Task whose value is the list of documents.</returns>
+    public static Task<List<T>> ToListInMongoAsync<T>(this IQueryable<T> source, CancellationToken cancellationToken = default)
     {
-        ArgumentNullException.ThrowIfNull(query);
+        ArgumentNullException.ThrowIfNull(source);
 
         // cast to IMongoQueryable<T>, if not possible, a type cast exception is thrown
-        var mq = (IMongoQueryable<T>)query;
+        var mq = (IMongoQueryable<T>)source;
 
         // execute the async operation
         return mq.ToListAsync(cancellationToken);
     }
 
+    /// <summary>
+    /// Returns the first element of a sequence.
+    /// This method removes the need to convert instances of <see cref="IQueryable{T}"/> to <see cref="IMongoQueryable{T}"/>.
+    /// </summary>
+    /// <typeparam name="T">The type of the elements of source.</typeparam>
+    /// <param name="source">An <see cref="IMongoQueryable{T}"/> to return the first element of.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>The first element in source.</returns>
+    public static Task<T> FirstInMongoAsync<T>(this IQueryable<T> source, CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(source);
+
+        // cast to IMongoQueryable<T>, if not possible, a type cast exception is thrown
+        var mq = (IMongoQueryable<T>)source;
+
+        // execute the async operation
+        return mq.FirstAsync(cancellationToken);
+    }
+
+    /// <summary>
+    /// Returns the first element of a sequence that satisfies a specified condition.
+    /// This method removes the need to convert instances of <see cref="IQueryable{T}"/> to <see cref="IMongoQueryable{T}"/>.
+    /// </summary>
+    /// <typeparam name="T">The type of the elements of source.</typeparam>
+    /// <param name="source">An <see cref="IMongoQueryable{T}"/> to return an element from.</param>
+    /// <param name="predicate">A function to test an element for a condition.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>The first element in source that passes the test in predicate.</returns>
+    public static Task<T> FirstInMongoAsync<T>(this IQueryable<T> source, Expression<Func<T, bool>> predicate, CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(source);
+
+        // cast to IMongoQueryable<T>, if not possible, a type cast exception is thrown
+        var mq = (IMongoQueryable<T>)source;
+
+        // execute the async operation
+        return mq.FirstAsync(predicate, cancellationToken);
+    }
+
+    /// <summary>
+    /// Returns the first element of a sequence, or a default value if the sequence contains no elements.
+    /// This method throws an exception if there is more than one element in the sequence.
+    /// This method removes the need to convert instances of <see cref="IQueryable{T}"/> to <see cref="IMongoQueryable{T}"/>.
+    /// </summary>
+    /// <typeparam name="T">The type of the elements of source.</typeparam>
+    /// <param name="source">An <see cref="IMongoQueryable{T}"/> to return the first element of.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>The first element of the input sequence, or default(T) if the sequence contains no elements.</returns>
+    public static Task<T> FirstOrDefaultInMongoAsync<T>(this IQueryable<T> source, CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(source);
+
+        // cast to IMongoQueryable<T>, if not possible, a type cast exception is thrown
+        var mq = (IMongoQueryable<T>)source;
+
+        // execute the async operation
+        return mq.FirstOrDefaultAsync(cancellationToken);
+    }
+
+    /// <summary>
+    /// Returns the first element of a sequence that satisfies a specified condition or a default value if no such element is found.
+    /// This method throws an exception if there is more than one element in the sequence.
+    /// This method removes the need to convert instances of <see cref="IQueryable{T}"/> to <see cref="IMongoQueryable{T}"/>.
+    /// </summary>
+    /// <typeparam name="T">The type of the elements of source.</typeparam>
+    /// <param name="source">An <see cref="IMongoQueryable{T}"/> to return a first element from.</param>
+    /// <param name="predicate">A function to test an element for a condition.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>The first element of the input sequence that satisfies the condition in predicate, or default(T) if no such element is found.</returns>
+    public static Task<T> FirstOrDefaultInMongoAsync<T>(this IQueryable<T> source, Expression<Func<T, bool>> predicate, CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(source);
+
+        // cast to IMongoQueryable<T>, if not possible, a type cast exception is thrown
+        var mq = (IMongoQueryable<T>)source;
+
+        // execute the async operation
+        return mq.FirstOrDefaultAsync(predicate, cancellationToken);
+    }
+
     /// <summary>
     /// Returns the only element of a sequence from Mongo, and throws an exception if there is not exactly one element in the sequence.
     /// This method removes the need to convert instances of <see cref="IQueryable{T}"/> to <see cref="IMongoQueryable{T}"/>.
     /// </summary>
-    /// <typeparam name="T"></typeparam>
-    /// <param name="query"></param>
-    /// <param name="cancellationToken"></param>
-    /// <returns></returns>
-    public static Task<T> SingleInMongoAsync<T>(this IQueryable<T> query, CancellationToken cancellationToken = default)
+    /// <typeparam name="T">The type of the elements of source.</typeparam>
+    /// <param name="source">An <see cref="IMongoQueryable{T}"/> to return the single element of.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>The single element of the input sequence.</returns>
+    public static Task<T> SingleInMongoAsync<T>(this IQueryable<T> source, CancellationToken cancellationToken = default)
     {
-        ArgumentNullException.ThrowIfNull(query);
+        ArgumentNullException.ThrowIfNull(source);
 
         // cast to IMongoQueryable<T>, if not possible, a type cast exception is thrown
-        var mq = (IMongoQueryable<T>)query;
+        var mq = (IMongoQueryable<T>)source;
 
         // execute the async operation
         return mq.SingleAsync(cancellationToken);
     }
 
+    /// <summary>
+    /// Returns the only element of a sequence from Mongo, and throws an exception if there is not exactly one element in the sequence.
+    /// This method removes the need to convert instances of <see cref="IQueryable{T}"/> to <see cref="IMongoQueryable{T}"/>.
+    /// </summary>
+    /// <typeparam name="T">The type of the elements of source.</typeparam>
+    /// <param name="source">An <see cref="IMongoQueryable{T}"/> to return a single element from.</param>
+    /// <param name="predicate">A function to test an element for a condition.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>The single element of the input sequence that satisfies the condition in predicate.</returns>
+    public static Task<T> SingleInMongoAsync<T>(this IQueryable<T> source, Expression<Func<T, bool>> predicate, CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(source);
+
+        // cast to IMongoQueryable<T>, if not possible, a type cast exception is thrown
+        var mq = (IMongoQueryable<T>)source;
+
+        // execute the async operation
+        return mq.SingleAsync(predicate, cancellationToken);
+    }
+
     /// <summary>
     /// Returns the only element of a sequence from Mongo, or a default value if the sequence is empty.
     /// This method throws an exception if there is more than one element in the sequence.
     /// This method removes the need to convert instances of <see cref="IQueryable{T}"/> to <see cref="IMongoQueryable{T}"/>.
     /// </summary>
-    /// <typeparam name="T"></typeparam>
-    /// <param name="query"></param>
-    /// <param name="cancellationToken"></param>
-    /// <returns></returns>
-    public static Task<T> SingleOrDefaultInMongoAsync<T>(this IQueryable<T> query, CancellationToken cancellationToken = default)
+    /// <typeparam name="T">The type of the elements of source.</typeparam>
+    /// <param name="source">An <see cref="IMongoQueryable{T}"/> to return the single element of.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>The single element of the input sequence, or default(T) if the sequence contains no elements.</returns>
+    public static Task<T> SingleOrDefaultInMongoAsync<T>(this IQueryable<T> source, CancellationToken cancellationToken = default)
     {
-        ArgumentNullException.ThrowIfNull(query);
+        ArgumentNullException.ThrowIfNull(source);
 
         // cast to IMongoQueryable<T>, if not possible, a type cast exception is thrown
-        var mq = (IMongoQueryable<T>)query;
+        var mq = (IMongoQueryable<T>)source;
 
         // execute the async operation
         return mq.SingleOrDefaultAsync(cancellationToken);
     }
+
+    /// <summary>
+    /// Returns the only element of a sequence from Mongo, or a default value if the sequence is empty.
+    /// This method throws an exception if there is more than one element in the sequence.
+    /// This method removes the need to convert instances of <see cref="IQueryable{T}"/> to <see cref="IMongoQueryable{T}"/>.
+    /// </summary>
+    /// <typeparam name="T">The type of the elements of source.</typeparam>
+    /// <param name="source">An <see cref="IMongoQueryable{T}"/> to return a single element from.</param>
+    /// <param name="predicate">A function to test an element for a condition.</param>
+    /// <param name="cancellationToken">The cancellation token.</param>
+    /// <returns>The single element of the input sequence that satisfies the condition in predicate, or default(T) if no such element is found.</returns>
+    public static Task<T> SingleOrDefaultInMongoAsync<T>(this IQueryable<T> source, Expression<Func<T, bool>> predicate, CancellationToken cancellationToken = default)
+    {
+        ArgumentNullException.ThrowIfNull(source);
+
+        // cast to IMongoQueryable<T>, if not possible, a type cast exception is thrown
+        var mq = (IMongoQueryable<T>)source;
+
+        // execute the async operation
+        return mq.SingleOrDefaultAsync(predicate, cancellationToken);
+    }
 }