1．I've ordered some pizza, so we needn't worry about cooking when we get home tired.
我已经预订了一些披萨饼，所以当我们到家感到累的时候就不必担心做饭的事了。
2．I couldn't have enjoyed myself more—it was a perfect day.
我从没有玩得这么开心过——真是完美的一天。
3．We needn't have bought so much food now that Suzie won't be with us for dinner.
既然苏西不和我们一起吃晚饭，我们本没必要买这么多的食物。
4．There is no class on Sunday. You needn't have woken me up so early.
星期天不上课，你本不必这么早叫醒我的。
5．It was an informal party so I didn't need to wear a suit.
这不是个正式晚会，所以我没有必要穿正装。
6．I bought some fruits home but my wife had bought a lot of them, so I needn't have bought any.
我买了一些水果，但我的妻子已经买了很多，因此我本不必买的。
7．Need you have paid so much?
你用得着花那么多钱吗？
