Question

where does he live? Do you know it?....... combaine the sentence

Answer 1

Hey mate the answer is

Do you know where he live?

Answer 2

Answer:

Do you know where does he live?

Explanation:

This sentence is the culmination of two sentences into one simple sentence. A simple sentence is a sentence with one main or independent clause only. It has only one subject and predicate.  

For example: It was raining heavily yesterday. The given sentences had to be changed into one simple sentence with a subject and a predicate. Here in this case, do you know is the subject and where does he live acts as the predicate.