Smoking must not allowed in the office .严禁在办公室吸烟。
You mustnt talk to girls like that .你绝不能那样对女孩子说话。
4)表示猜测、推测must常用于肯定句中表示猜测。对现在或未来的事进行猜测时,后接动词原形;对已经发生的事进行猜测时,后接have + 过去分词。例如:
You must be tired after working so long .你工作这么久以后,肯定累了吧。
It must be that naughty boy crying outside .肯定是那个调皮的孩子在外面大叫。
The idea must be accepted by the society sooner or later.
这种想法肯定或迟或早会被社会所接受的。
It must have rained last night for it is so wet outside .
外面这么湿,昨晚肯定下雨了。
I didnt see you in class yesterday. You must have been
absent .我昨天上课没见着你,你肯定没有来。
Ought (后接带to的不定式构成谓语动词)应该
1)表示出于职责、义务该做某事
You ought not to be so careless in your work .你不应该在工作上如此粗心大意。
We ought to study hard for the sake of our motherland.
我们应该为了我们的祖国而努力学习。
His doctor said to him that he oughtnt to smoke so much .
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