Hurry up!Alice and Sue are waiting for you at the school gate.
-Oh!I thought they had gone without me.
我想他们已经走了.
想是发生在过去,他们已经走了是发生在我想之前,即过去的过去,故用过去完成时
Put these books and magazines where they were or the librarian will punish you .
把这些书和杂志放回原处,否则图书管理员会要求你赔偿的