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1 Were you in a shop or a theatre? A shop.
2 Who were you with? My wife.
3 She was trying a hat on, wasn't she? Yes, she was.
4 What did you say to your wife? ‘Do you call that a hat?’
5 Did she think you were being rude? Yes, she did.
6 How long had you been in the hat shop?Half an hour.
7 What was the remark you suddenly made? ‘We mustn't buy things we don't need.’
8 How soon did you regret saying it? Almost at once.
Do you call that a hat?
We mustn't buy things we don't need.
首先，这句话中mustn’t表示“不应该”，是表示一种“禁止”的意思。大家知道：must是表示“必须做某事”，而其否定形式就是mustn’t，表示“不应该，不准、禁止”干某事。而和我们前面说的needn’t做比较可以看出，needn’t表示“不必要，没必要”干某事，但仍可以干。试比较：
You needn’t shout; he can hear you.你不必喊，他能听到你。
You mustn’t shout; Tom is sleeping.你不准喊，汤姆在睡觉。
在we don’t need中，这个need是个普通动词，是个实义动词，表示“需要”。所以things we don’t need就表示“我们不需要的东西”。
