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英语新概念一册,第128课的课后题,

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英语新概念一册,第128课的课后题,
我不是不会,只是弄不懂题目到底是什么意思,他给你两个例句,可是到底用has to还是用I think he is probably?
原题:Written exercises 书面练习
A Rewrite these sentences, using either has to or I think he is probably ...模仿例句,使用has to或I think he is probably ... 改写以下句子.
Examples:
He must be home before six o'clock.
He has to be home before six o'clock.
He must be tired.
I think he is probably tired.
1 He must be here at six o'clock.
2 He must be busy.
3 He must be at the office early tomorrow.
4 He must be sleeping.
5 He must be French.
6 He must be in France next week.
7 He must be an engineer.
B Write new sentences.
英语新概念一册,第128课的课后题,
应该是根据题意选择运用哪一种.
如:He must be home before six o'clock.
他必须在6点钱回家.换句话讲,他不得不在六点前回家.必须的,不得不的用has to
He must be tired.他应该累了.
表示揣测的,不确定的.可以用I think he is probably...