Question

Dad told me I could buy my own car when I am mature enough to accept the responsibility.

The adverb clause in this sentence is _____.

Dad told me I could buy my own car
when I am mature enough
when I am mature enough to accept the responsibility
I could buy my own car

Answer 1

when I am mature enough to accept the responsibility

This is an adverbial clause of time (introduced by "when") with subject "I" and verb "am," modifying when the speaker may buy the car.