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too to短语在哪几种情况下是肯定含义?

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too to短语在哪几种情况下是肯定含义?
too to短语在哪几种情况下是肯定含义?
1)too…to  太…而不能…
  He is too excited to speak.
  他太激动了,说不出话来.
I'm afraid the box is too heavy for you to carry it. 这箱子太重,恐怕你搬不动.
2) 如在too前有否定词,则整个句子用否定词表达肯定,too 后那个词表达一种委婉含义,意 为"不太".
It's never too late to mend. (谚语)
   改过不嫌晚.
3) 当too 前面有only,all,but时,意思是:非常… 等于very.
I'm only too pleased to be able to help you.我非常高兴能帮助你.
He was but too eager to get home.他非常想回家.