摘要: must “必须,应该,一定,准是 .表示说话人认为有必要做某事.命令.要求别人做某事以及对事物的推测.must 用来指一般现在时和一般将来时. 过去式可用 have to 的过去式代替. I must finish my work today. 我今天必须完成我的工作. You mustn't work all the time. 你不能老是工作. Must I return the book tomorrow? 我必须明天还书吗? After such a long walk, you must be tired. 走了这么长的路, 你一定累了. He must be the man I am looking for. 他一定是我要找的人. He had to go because of somebody’s calling him that day. 那天他要走.因为有人叫他. 值得注意的是: (1)must + have + 过去分词.表示现在对过去事物的推测. He must have told my parents about it. 他一定把这件事情告诉我父母亲了. He must have received my letter now. 他现在一定收到我的信了. It's six o'clock already, we must have been late again. 已经六点钟了.我们一定又迟到了. (2)must 和 have to 的区别: must 表示说话人的主观思想, have to “不得不,必须 .表示客观需要.客观条件只能如此. You must do it now. 你必需现在就干. I have to go now. 我得走了. You must be here on time next time. 你下次一定要按时来. I have to cook for my child. 我得给孩子做饭.

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