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2017届英语科5年高考3年模拟[浙江专版] 专题0【备考策略】o be doing 一般式：不定式所表示的动作和谓语动词所表示的动作或状态同时发生或几乎同时发生或存在。但多数情况下是在谓语动词所表示的动作之后发生。 Eg :They often watch us play football. (同时) She hopes to go there again. (之后发生) 完成式：不定式所表示的动作或状态发生在谓语动词所表示动作或状态之前。 Eg : I’m glad to have seen your mother yesterday 注：1）用在intended, expected, meant, hoped. promised, wanted, planned. wished. thought, desired, was, were等后，表示过去没有实现的愿望，期待或计划的等，也用来表示先于谓语动词发生的动作或状态。 Eg: He wanted to have met (=had wanted to meet) you at the airport,but he didn’t get there in time. 他原想去机场接你（事情已经发生），但他没及时赶到那儿。（没接成） We planned to have done (had planned to do) good deeds for the poor people last month. 我们原计划上个月为贫困的人们作些好事。（没作成）。 2）用在seem. appear. think . consider. believe. 等后，表示一个动作先于另一发生 The novel is believed to have been translated into Chinese. | 
