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1. 不定式的否定式的构成 通常是将否定词not或never置于不定式之前，即构成not to do 或never to do 的形式，注意not和never一定要放在不定式符号to的前面，而不是其后面： The doctor advised me not to smoke. 医生劝我不要抽烟。 Its politically short-sighted not to do so. 不这样做在政治上是短视的。 He strongly advised me not to do so. 他使劲劝我别这样做。 Take care not to break it. 小心别把它打破了。 Be careful not to break anything. 当心别打破什么了。 She had sense enough not to say anything about it. 她有足够的头脑不提此事。 Father warned me never to drive after drinking. 父亲警告我不要酒后开车。 Visitors are requested not to touch the exhibits. 参观的人请勿触摸展品。 【注意】若不定式为完成式和被动式，否定词应置于整个结构之前： She pretended not to have seen him. 她假装没看见他。 It is nice not to be dependent on others. 不依靠别人是好的。 You were silly not to have locked your car. 你没锁车太傻了。 2. so as to do sth 和in order to do sth 的否定式 | 
