英语中的几个语法问题1.have的相关用法?比如“我已经吃了”,是用过去式还是用have+do表示已经完成某事了呢?还有一些have do have done had do had done等等份不清楚.2.must的用法?什么时候用must be ?最
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![英语中的几个语法问题1.have的相关用法?比如“我已经吃了”,是用过去式还是用have+do表示已经完成某事了呢?还有一些have do have done had do had done等等份不清楚.2.must的用法?什么时候用must be ?最](/uploads/image/z/7040414-38-4.jpg?t=%E8%8B%B1%E8%AF%AD%E4%B8%AD%E7%9A%84%E5%87%A0%E4%B8%AA%E8%AF%AD%E6%B3%95%E9%97%AE%E9%A2%981.have%E7%9A%84%E7%9B%B8%E5%85%B3%E7%94%A8%E6%B3%95%3F%E6%AF%94%E5%A6%82%E2%80%9C%E6%88%91%E5%B7%B2%E7%BB%8F%E5%90%83%E4%BA%86%E2%80%9D%2C%E6%98%AF%E7%94%A8%E8%BF%87%E5%8E%BB%E5%BC%8F%E8%BF%98%E6%98%AF%E7%94%A8have%2Bdo%E8%A1%A8%E7%A4%BA%E5%B7%B2%E7%BB%8F%E5%AE%8C%E6%88%90%E6%9F%90%E4%BA%8B%E4%BA%86%E5%91%A2%3F%E8%BF%98%E6%9C%89%E4%B8%80%E4%BA%9Bhave+do+have+done+had+do+had+done%E7%AD%89%E7%AD%89%E4%BB%BD%E4%B8%8D%E6%B8%85%E6%A5%9A.2.must%E7%9A%84%E7%94%A8%E6%B3%95%3F%E4%BB%80%E4%B9%88%E6%97%B6%E5%80%99%E7%94%A8must+be+%3F%E6%9C%80)
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