The boy said,My father is often away during the week on business trips His doctor replied.IF you don't stop smoking you run the risk of a heart attack Separate appositives a noun,or noun phrase or non-defining relative clauses
Bill Gates,the richest man in the world,comes from Seattle.
My only sister,who is a fantastic tennis player,is in great shape.
The question mark is used at the end of a question.
Where do you live
How long have they been studying