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与情态动词must相关的考试题在每年的高考试题中频繁出现，是一项重要的考查内容。因为要弄清相关内容难度较大，所以也是考试中失分较严重的方面。因此，有必要在此对must的相关考法加以归纳，以便为学生复习提供参考。
总体来说must主要有两个汉语意义即就是：（1）表示强烈要求“必须、非——不可”；（2）表示有把握的推测“肯定、想必”下面对此分别加以介绍。
一、must表强烈要求“必须、非——不可”
例如：
1.——Must you stop your plan， sir？
——Yes， we must， otherwise we’ll be faced with much trouble.
2.——Mom， must I finish all the work today？
——No， you needn’t / No， you don’t have to. You can leave it to tomorrow.
3.——They must be separated from each other， must they？
——Yes， they must. / No， they needn’t / No， they don’t have to.
4. ——Students mustn’t stay up into deep night， can they？
——Yes， they can. / No， they mustn’t.
5. ——May I take these books out of the library， Sir ？
——Of course， you may. / No， you mustn’t.
6. Teachers must park their cars behind the teaching building .（变否定）
→Teachers mustn’t park their cars behind the building.
二、must 表有把握的推测“肯定、想必”，其疑问形式不能用must提到句首，否定形式不能用mustn’t. 请看下面分解：
（一）、用在一般现在时态中，构成形式为：must 动词原形。
1.用在一般现在时态be动词作谓语，对当前情况的推测。
例如：
1）. Your father must be an engineer.
2）. Your father can’t be an engineer.
3）. ——Can your father be an engineer？
——Yes， he is. / No， he isn’t.
4）. ——Your father must be an engineer， isn’t he？
——Yes， he is. / No， he isn’t.
2.用在一般现在时态行为动词作谓语，表示对当前情况的推测。
例如：
1）. The visitor must come from South China.
2）. The visitor can’t come from South China.
3）. ——Can the visitor come from South China？
——Yes， he does. / No， he doesn’t.
4）. ——The visitor must come from South China， doesn’t he？
——Yes， he does， / No， he doesn’t
（二）用在现在完成时态中表示对已经存在的情况进行推测，构成形式为：must have 过去分词。
例如：
1. The foreign teacher must have arrived at our school.
2. The foreign teacher can’t have arrived at our school.
3. ——Can the foreign teacher have arrived at our school？
——Yes， she has. / No， she hasn’t.
4）. ——The foreign teacher must have arrived at our school， hasn’t she？
——Yes， she has. / No， she hasn’t.
（三） 用在一般过去时态中表示对过去情况的推测，（一般有明确的表示过去的时间状语）构成形式为：must have 过去分词。
例如：
1. The traffic accident must have happened a few weeks ago.
2. The traffic accident couldn’t have happened a few weeks ago.
3. ——Can the traffic accident have happened a few weeks ago？
——Yes， it did. / No， it didn’t.
4. ——The traffic accident must have happened a few weeks ago， didn’t it？
——Yes， it did. / No， it didn’t.
（四） 用在现在进行时态中表推测，构成形式为：must be v-ing .用在被动语态中表推测，构成形式为：must be 过去分词。这两种用法和be动词构成系表结构用法相仿，这里不加细讲。
三、用于表示把握性不大的推测常常用到may， might， can， could.
例如：
1. ——Can they make such a decision？
——Yes， it’s possible./ No， it’s unlikely.
2. According to the new arrangement， the sports meet may be put off to next month， but I’m not sure about it.
3. The secret might have been known by our head teacher ， for she appeared to feel down the whole morning.
需要说明的是在平时的学习过程中，同学们要根据语言环境灵活理解领悟must的不同含义，只有这样才能真正掌握must的不同用法。
总体来说must主要有两个汉语意义即就是：（1）表示强烈要求“必须、非——不可”；（2）表示有把握的推测“肯定、想必”下面对此分别加以介绍。
一、must表强烈要求“必须、非——不可”
例如：
1.——Must you stop your plan， sir？
——Yes， we must， otherwise we’ll be faced with much trouble.
2.——Mom， must I finish all the work today？
——No， you needn’t / No， you don’t have to. You can leave it to tomorrow.
3.——They must be separated from each other， must they？
——Yes， they must. / No， they needn’t / No， they don’t have to.
4. ——Students mustn’t stay up into deep night， can they？
——Yes， they can. / No， they mustn’t.
5. ——May I take these books out of the library， Sir ？
——Of course， you may. / No， you mustn’t.
6. Teachers must park their cars behind the teaching building .（变否定）
→Teachers mustn’t park their cars behind the building.
二、must 表有把握的推测“肯定、想必”，其疑问形式不能用must提到句首，否定形式不能用mustn’t. 请看下面分解：
（一）、用在一般现在时态中，构成形式为：must 动词原形。
1.用在一般现在时态be动词作谓语，对当前情况的推测。
例如：
1）. Your father must be an engineer.
2）. Your father can’t be an engineer.
3）. ——Can your father be an engineer？
——Yes， he is. / No， he isn’t.
4）. ——Your father must be an engineer， isn’t he？
——Yes， he is. / No， he isn’t.
2.用在一般现在时态行为动词作谓语，表示对当前情况的推测。
例如：
1）. The visitor must come from South China.
2）. The visitor can’t come from South China.
3）. ——Can the visitor come from South China？
——Yes， he does. / No， he doesn’t.
4）. ——The visitor must come from South China， doesn’t he？
——Yes， he does， / No， he doesn’t
（二）用在现在完成时态中表示对已经存在的情况进行推测，构成形式为：must have 过去分词。
例如：
1. The foreign teacher must have arrived at our school.
2. The foreign teacher can’t have arrived at our school.
3. ——Can the foreign teacher have arrived at our school？
——Yes， she has. / No， she hasn’t.
4）. ——The foreign teacher must have arrived at our school， hasn’t she？
——Yes， she has. / No， she hasn’t.
（三） 用在一般过去时态中表示对过去情况的推测，（一般有明确的表示过去的时间状语）构成形式为：must have 过去分词。
例如：
1. The traffic accident must have happened a few weeks ago.
2. The traffic accident couldn’t have happened a few weeks ago.
3. ——Can the traffic accident have happened a few weeks ago？
——Yes， it did. / No， it didn’t.
4. ——The traffic accident must have happened a few weeks ago， didn’t it？
——Yes， it did. / No， it didn’t.
（四） 用在现在进行时态中表推测，构成形式为：must be v-ing .用在被动语态中表推测，构成形式为：must be 过去分词。这两种用法和be动词构成系表结构用法相仿，这里不加细讲。
三、用于表示把握性不大的推测常常用到may， might， can， could.
例如：
1. ——Can they make such a decision？
——Yes， it’s possible./ No， it’s unlikely.
2. According to the new arrangement， the sports meet may be put off to next month， but I’m not sure about it.
3. The secret might have been known by our head teacher ， for she appeared to feel down the whole morning.
需要说明的是在平时的学习过程中，同学们要根据语言环境灵活理解领悟must的不同含义，只有这样才能真正掌握must的不同用法。