Who is your teacher?
Could you tell me who your teacher is?
What time is it?
Do you know what time it is?
When is Jim going home?
I don't know when Jim is going home.
Note: If the embedding question is included in a question, it is followed by a question mark. If it is in a statement, use a period.
Are you hungry?
I asked you if you were hungry.
Do you like your job?
She asked me if I liked my job.