What is the homework?
When can I leave?
Where are you going?

Also, these words can join together two clauses, and in this case the subject and verb that follow are NOT inverted.

I do not know what the homework is.
When I can leave, I will take the first train.
Do you know where you are going?

In each of these examples there are two clauses joined by a question word. Notice that the subjects and verbs that follow the question words “what, when, and where” are not inverted in this case.
The following example shows how this sentence pattern could be tested in structure

Example:

The lawyer asked the client why _____ it.
A. did he do
B. did he
C. he did
D. did

Answer:
In this example the question word “why” is used to connect the two clauses, so a subject and verb are needed after this connector; this is not a question, so the subject and verb should not be inverted. The best answer is therefore answer (C).

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