
Adverb clause of time
An adverb clause is a subordinate clause. It must be attached to a main clause. Adverb clauses of time are introduced by the subordinating conjunctions while, after, whenever, before, since, as, till, until etc.
While you were playing I was working.
Don’t use the cell phone while you are driving.
As I was walking down the street, I saw James driving a Porsche.
He went to work after he......