they的五种形式

　　They think I can't do it, but I'll show them!

　　他们以为我做不了，我却要做给他们看看！

　　It's difficult for them to get here much before seven.

　　他们很难在7点以前早早地来到这里。

　　This child is nobody's child until someone makes her theirs officially.

　　在有人办理正式手续认领以前，这个孩子不属于任何人。