Model Verbs
You must be joking! 你一定是在开玩笑! You cant be serious! 你不会是认真的吧! That may be so. 那也许是这样。There must be some mistake. 准是出了什么差错。
1. must作必须、准是、一定讲,表示我们对某事确有把握的推论或揣测。而另外一个表示推测的词 may/might 就比 must 在语气上要稍弱一些,如:
I always meet him at the street. He must live quite near here. 我总在这条街碰见他,想必他就住在附近。I always meet him at the street. He may/might live quite near here. 我常在这条街碰到他,可能他就住在这附近。
2. must 表示推测只用于肯定句。疑问句、否定句中常用can(cant)。如:Can he really be ill? 他真的病了吗? What do you think this invitation can mean? 你认为这份请柬可能意味着什么呢? She cant be a professor shes so young. 她不可能是教授 她那么年轻。
3. 情态动词 + be doing表示对现在正在发生的动作表示推测;情态动词 + have done表示对过去的推测,如:He might be doing his lessons now. 他也许正在做功课吧。Can he really be waiting for us? 他真地在等我们?It must have rained last night. 昨天晚上肯定下雨了。Can she have told a lie? 她会说谎吧?
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