I don’t know when he ____. But if he ____, I’ll ring you up.

James is an English boy. He _____ from England.

Excuse me, does Mr. Zhang’s son live here? —He________ be here, but he has moved?

I can’t find the bookstore _____ my father bought the book for me yesterday.

I saw him in the library yesterday. He ________ a book at that moment.