语法专项提升非谓语动词• 动词不定式 •不定式动词在介词but , except , besides 后面时,若这些介词前有实义动词 do 的各种形式,则后接不带 to 的不定式,否则带 to 。• 在 cannot but , cannot choose but , cannot help but 之后接不带 to 的不定式。• I have no choice but to wait. 我除了等别无选择。• I can’t do anything but go out with her.• 我除了和她一起出去什么也不能做。• I could not but admit that he was right and I was wrong.• 我不得不承认他对了,我错了。• I cannot help but wait for him. 我不得不等他。• I cannot choose but tell him the truth.• 我不得不告诉他真相。•不定式作状语• (1) 不定式作状语,其逻辑主语与句子的主语必须一致。• To learn English well , he needs a good dictionary.• 为了学好英语,他需要一本好词典。 ( 而不能说:To learn English well , a good dictionary is needed.)• (2) 有些不定式短语可以作独立成分,通常位于句首,有时位于句中或句尾,需要用逗号同其他句子成分隔开。• To be honest , I know nothing about it.• 说实话,我对那件事一无所知。• 常见的这类短语有: to tell the truth , to be frank ( 坦率地说 ) , to be exact , to begin with 。• (3) 不定式作结果状语时,常表示一种意外的结果,尤其是和 only 连用时,常用 only to find 。• He ran to the station only to find the train had left.• 他跑到火车站却发现火车已开走。•不定式的主动形式表示被动意义• (1) 不定式作定语与被修饰名词或代词构成动宾关系,并且不定式的逻辑主语就是句子的主语。• I have something important to do. 我有要事要做。• 注意:当不定式的逻辑主语不是句子的主语时,动词不定式常用被动形式。• I’m going to the market.Do you have anything to be bought?• 我要去市场,你有东西让我替你买吗?• (2) 某些动词的不定式可以与 be 连用,常见的有to blame , to see , to let 等。• In the accident , the car driver was to blame.• 在这次事故中,轿车司机应受责备。• 分 词 •分词的时态和语态分词时态...