Interrogative Adverbs

Definition Of Interrogative Adverb:

Adverbs of Degree used in asking questions.

Example Sentences for Interrogative Adverb

Why are you late?

When did you come?

Where are you going?

Why did you go there?

Whence will the train arrive?

Defining relative clause
When a clause defines the noun it qualifies it is known as a defining relative clause.