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同义句改写 (1)He doesn’t know what he will talk about.(改为简单句) (2)I really have no idea whether I will accept her invitation or not.(改为简单句) (3)Why don’t you stop to have a rest？(用why not改写) 多维训练 He doesn’t know what to talk about. I really have no idea whether to accept her invitation or not. Why not stop to have a rest? 答案 Frederick William I，the King of Prussia，could never have imagined that his greatest gift to the Russian people would have such an amazing history.普鲁士国王腓特烈威廉一世怎么也不会想到他送给俄罗斯人民的厚礼会有这样一段令人吃惊的历史。 12. 句型公式：could have done (1)can/could have done用于否定句或疑问句中，表示对过去发生事情的推测，意为“可能已经……”。 (2)could have done用在肯定句中，意为“本能够做……(而实际未做)”。 (3)must have done表示推测(用于肯定句)，意为“一定/准是已经……”。 (4)may/might have done表推测(多用肯定句或否定句)，意为“可能……”。 (5)might have done本可以做……，本该做……(实际未做)。 (6)should/ought to have done本该做……(而实际未做)。 (7)needn’t have done本没必要做……(实际做了)。 (1)There is no light in the room，can they have gone out? 屋里没亮灯，他们有可能出去了吗？ (2)—I stayed at a hotel while in New York. —Oh，did you？You could have stayed with Barbara. ——在纽约时我住在一家旅馆里。 ——噢，是吗？你本来能够和巴巴拉住在一起的。 (3)—I spent two weeks in London last summer. —Then you must have visited the British Museum during your stay，didn’t you? ——去年夏天我在伦敦呆了两周。 ——那么在此期间你一定参观过大英博物馆了，是吗？ 根据句意用合适的情态动词填空 (1)I | 
