例句：
1、She gets very upset if I exclude her from anything
要是有什么事情我不讓她參加，她會非常難過。
2、He asked if I had left with you, and I said no
他問我是否和你一塊兒離開的，我說不是。
3、Sometimes, that standard is quite difficult, if not impossible, to achieve
有時即便有可能達到那個標準，那也是非常困難。
4、If I could just make another small point about the weightlifters in the Olympics
請允許我就有關奧運會舉重運動員的問題再補充一點。
5、I wonder if you'd be kind enough to give us some information, please?
請問您能不能給我們提供一些信息？