i want information on adverbial clauses & advrbial phrases?

Adverbial clause: A dependent clause that has a subject and a predicate and modifies the verb is called an adverbial clause. For example:

She met me when I was in the hospital.

She had hardly reached the school when the bell rang.

Adverbial phrase: A group of words acting adverbially is called an adverbial phrase. For example:

He will reach the office a little late.

We have to vacate this room in two hours.