should/ought to have done "本来该做某事"(而实际未做) should not/ought not to have done "本来不该做"(实际却做过了,含有责备语气)needn't have done "本来不必做"(但是已经做过了) would rather have done "当时宁愿做了某事"(实际没有做过);否定式would rather ...
(1)usedto表示“过去常常”隐含现在不这样了,其中to是不定式符号,后跟动词原形,仅用于过去时态。 (2)be/get/becomeusedto表示“习惯于”时,意为“变得习惯于“或“开始习惯于”。 (3)beusedtodo表示“被用来”。 十、情态动词后的某些动词形式 1、情态动词+havedone (...
①Chinese entrepreneurs have been working hard to become leading innovators,aiming at responding to consumer market... (16年6 月CET6,第一套) 中国企业家也在努力争做创新的先...
例1:While producing large quantities of CO2, these computers emit a great deal of heat, so the centers need to be well air-conditioned, which uses even more energy. 译文:当这些计算机产生大量二氧化碳的同时,还释放出了大量的热量,因此数据中心又必须装备...
1. If sb had done sth (坏事), sb would never have done sth (好事). 如果某人过去做了某事(坏事),那么他永远不可能做某事。 If Hugh Miller, after toiling all day in quarry (采石场), had devoted his evenings to rest and recreation, he would never have be...
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