②I do not believeit is the best or only way toprotect the environment; in fact, it is only a small part of what is needed in a global initiative. ③We have seen and contin...
(4)could have+过去分词,表示过去本来可以做但却未做,译为“完全可以……”。如: What you said is right, but you could have phrased it more tactfully. (5)may/might have + 过去分词,表示过去可以做但实际未做,译为“(那样)也许会……”。如: It might have been...
1. You could have done better, but you didn’t try your best.(虚拟语气)2. He can’t have been to that town.(推测)3. Can he have got the book?(推测) 2) may / might +不定式完成式(have done)表示对过去行为的推测。不能用于疑问句中,没有虚拟语气的用法。Mi...
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