英语中有些句子形式上是否定的,但是内容含义上却是肯定的。一、cannot wait后跟不定式,意为“急于做”,表示强调的肯定。例如: I couldn’t wait to see her．我非常渴望见到她。I cannot wait to read the book．我非常渴望读到这本书。二、cannot/couldn’t+too意为“越……越……,非常,无论怎样……也不过分”。在此结构中,cannot也可改用can hardly,scarcely,never,impossible;too也可改用over,enough等。例如: Some sentences in English are formally negative, but the meaning of content is affirmative. First, cannot wait followed by infinitive, meaning “emergency to do”, that affirmed the emphasis. For example: I couldn’t wait to see her. I am very eager to see her. I cannot wait to read the book. I am very eager to read this book. Second, cant/couldn’t+too means “the more...the more...the more, no matter how...not too much”. In this structure, cannot can also be changed to can hardly, scarcely, never, impossible; too can also be used over, enough, etc. E.g: