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You can make a sentence that has an interrogative adverb. For example,

Tell me why you did it.

I don't know which one is better.

What do you say the sentence? As far as I remember, you have the name.

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Tell me why you did it.

I don't know which one is better.

The two underlined expressions are subordinate interrogative clauses (embedded questions). The meanings, respectively, are:

"Tell me the answer to the question 'Why did you do it?'"

"I don't know the answer to the question 'Which one is better?'"

Comments  
SupercatWhat do you say call the sentence?

As shown.

CJ