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Modals 情态动词
从下面选项中选择正确答案；单击“核对答案”按钮，核对你的答案.
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1 : When we were children, we __________ tidy our rooms before we could watch TV.
must
had to
have to
should
The possible answers were:
must
had to
have to
should
You said:
must
had to
have to
should
对不起，这不是正确答案。你不能在过去时态的句子中使用 must.
恭喜你，答对了！ Must 和 have to 的过去式都是had to.
对不起，这不是正确答案。 这里的时态不对。
对不起，这不是正确答案。Should 不是一个过去式，不能用在这个过去时态的句子中。
你没有回答这个问题。
2 : Now I have a good salary, I __________ worry about paying the rent.
mustn't
have to
don't have to
must to not
The possible answers were:
mustn't
have to
don't have to
must to not
You said:
mustn't
have to
don't have to
must to not
对不起，这不是正确答案。Must 是必须的意思，有一种强制性，不做不行。但这个句子的语气并没有这么强烈，仅仅是说没有必要担心。所以你需要另外一个情态动词。
恭喜你，答对了！这句话是说，我没有必要担心交房租了。
对不起，这不是正确答案。 Must to not 语法上不正确。
对不起，这不是正确答案。Have to 是说有必要担心。显然和这个句子想表达的意思相反。
你没有回答这个问题。
3 : Which sentence has the strongest obligation?
I have to call my mum because it's her birthday.
I ought to call my mum because it's her birthday.
I should call my mum because it's her birthday.
I could call my mum because it's her birthday.
The possible answers were:
I have to call my mum because it's her birthday.
I ought to call my mum because it's her birthday.
I should call my mum because it's her birthday.
I could call my mum because it's her birthday.
You said:
I have to call my mum because it's her birthday.
I ought to call my mum because it's her birthday.
I should call my mum because it's her birthday.
I could call my mum because it's her birthday.
恭喜你，答对了！ Have to 表示有一种责任性或强制性做某事。如果不做那件事，可能会有后果产生。
对不起，这不是正确答案。尽管ought to 有时语气也很强烈，但是这里没有have to 强烈，并且这种责任感更多由外部原因引起。
对不起，这不是正确答案。Should 表示一种比较弱的责任性。
对不起，这不是正确答案。Could 不表示责任性。它只表示一种可能性。
你没有回答这个问题。
4 : You __________ use a video camera to record films while you are in the cinema. It's illegal.
oughtn't to
can't
shouldn't
don't have to
The possible answers were:
oughtn't to
can't
shouldn't
don't have to
You said:
oughtn't to
can't
shouldn't
don't have to
恭喜你，答对了！ Can't 在这句话中是指有规定或者法律限制人们做某些事情。
对不起，这不是正确答案。Shouldn't 这个情态动词的强制性和责任性不够强，不能表达出对违反规定或法律的限制。
对不起，这不是正确答案。Don't have to 意思是说没有必要。显然有些辞不达意。你需要使用另外一个情态动词。
对不起，这不是正确答案。Oughtn't to 这个情态动词的强制性和责任性不够强，不能表达出对违反规定或法律的限制。
你没有回答这个问题。
5 : For us, the ideal house __________ have three bedrooms but it__________ have a big kitchen. Kitchens aren't very important for us as we rarely cook.
must/ mustn't
should/ shouldn't
can/ can't
has to/ doesn't have to
The possible answers were:
must/ mustn't
should/ shouldn't
can/ can't
has to/ doesn't have to
You said:
must/ mustn't
should/ shouldn't
can/ can't
has to/ doesn't have to
对不起，这不是正确答案。尽管第一个选项是正确的，但是第二个选项mustn't 语气太强了，用在这里不合适。
对不起，这不是正确答案。尽管第一个选项是正确的，但是第二个选项shouldn't 语气太强了，用在这里不合适。
对不起，这不是正确答案。尽管第一个选项是正确的，但是第二个选项can't 语气太强了，用在这里不合适。
恭喜你，答对了！ Has to 表示三个卧室是必须的，doesn't have to 表示没有必要有一个大厨房。
你没有回答这个问题。
6 : The doctor says he __________ be careful about his weight and diet because he has a history of heart disease in his family.
must
has to
should
all of the above
The possible answers were:
must
has to
should
all of the above
You said:
must
has to
should
all of the above
恭喜你，答对了！
对不起，虽然 must 用在这里是正确的，但是其它选项也有正确的。
对不起，这不是正确答案。虽然 has to用在这里是正确的，但是其它选项也有正确的。
对不起，这不是正确答案。虽然 should 用在这里是正确的，但是其它选项也有正确的。
你没有回答这个问题。
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