情态动词＋have done的用法精析精练 1. “情态动词＋have done”表示推测 可以这样用的情态动词有can, could, may, might, must, 它们都表示对已经发生或完成的情况的推测。can仅用在否定句及疑问句中；must仅用在肯定句中；may/might不用于疑问句中。 There is nowhere to find them. Where can they have gone? 哪里都找不到他们。他们去哪儿了呢？ You can’t have seen her in her office last Friday; she’s been out of town for two weeks. 上周五你不可能在办公室看到她。她两周前出城了。 He is upset. He must have been punished. 他很沮丧，一定是被惩罚了。 Tom may have passed the driving test, but I am not sure about it. Tom有可能会通过驾照考试，但是我不确定。 2. “情态动词＋have done”表示虚拟语气 可以这样用的情态动词有could, might, should, need(只用否定形式)等，它们都表示与事实相反的情况，一般意为“本……(事实却不这样)”。 Considering his ability, he could have done it better. 考虑到他的能力，他能够做得更好。 不背单词电脑版 囧记单词 新概念英语青少版 He might have given you more help, even though he was busy. 他应该帮助你，尽管他很忙。 You should have told me earlier. 你应该早点告诉我。 I’m sorry. I shouldn’t have been so rude to you. 很抱歉，我不应该那么粗鲁的对待你。 He needn’t have gone to the station yesterday. 他昨天没有必要去车站。 （1） In our life, we often regret what we did and what we couldn’t did. Actually, it doesn't benefit us at all. As for most of us, we missed many chance to earn more money, to get a high position and to realize our dreams. We often regret that we don't seize those opportunities, thus feel upset. Although we do know regretting the past is no benefit, yet we still shouldn't help doing it. To avoid the problem below, we need to pay more attention to what you are doing now, making us busier and having no time to recall the past. Moreover, we’d better set reasonable goals one by one. Only by doing so must we struggle for our future better. （2） When I first learn to write in English, I ran into much difficulties. The main problem was that I always think in Chinese and tried to translate into English everything which I came across. My teacher advised I kept a diary. I followed his advice and put down 100 words or so each day. Soon I began to enjoy talk to myself and I can express myself in simple English. One day I wrote a story and showed to my teacher. He liked it very much that he read it to the class. All said that the story was a good one. Their words were an great encouragement to me.