Check if the given sentence contains a dependent clause.
He closed the door before he left the room.
Yes, the given sentence contains a dependent clause. The dependent clause in this sentence is "before he left the room" because it cannot stand alone as a complete sentence and relies on the independent clause "He closed the door" for meaning.
Complete the following task based on the instruction and optional input provided.### Instruction:
Check if the given sentence contains a dependent clause.

### Input:
He closed the door before he left the room.

### Output:
Yes, the given sentence contains a dependent clause. The dependent clause in this sentence is "before he left the room" because it cannot stand alone as a complete sentence and relies on the independent clause "He closed the door" for meaning.