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