What type of clause is in the sentence Since you left our house early we washed car?

The clause "Since you left our house early" is a subordinate clause, specifically an adverbial clause. Here's why:

* Subordinate Clause: It cannot stand alone as a complete sentence. It needs the main clause ("we washed the car") to make sense.

* Adverbial Clause: It modifies the main clause, providing information about the time or reason for the action ("we washed the car").

In this case, the adverbial clause acts as an adverb of time, indicating that the washing of the car occurred after you left.