9) Have you known his parents for many years?
10) Had both sisters already left when I returned?
11) Has the machine now recently come from Germany?
9) Have you known his parents for many years?
Yes, I have known his parents for many years.10) Had both sisters already left when I returned?
Yes, both sisters had already left when you returned.11) Has the machine now recently come from Germany?
Yes, the machine has recently come from Germany.