语 境 自 主 领 悟
先观察原句
后自主感悟
1.In addition, you need to know how long you should stay, and when you have to leave.
2.You needn't worry about situations like these if you have good social skills.
3.In some countries, for example, you have to arrive on time at a party; in other countries, you don't need to.
4.My American friend Tom spoke good Chinese, so I didn't need to translate the speech for him.
5.I was the first to go there.I needn't have gone there so early.
1.句1、句3和句4中的need为实义动词，后接动词时需加不定式符号to；句2和句5中的need为情态动词。
2.句4中didn't need to do表示“过去没必要做，实际上也没做某事”；句5中needn't have done表示“过去没必要做，实际上却做了某事”。
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