would have to跟will have to和have to有什么区别?

would have to跟will have to和have to有什么区别?

题目
would have to跟will have to和have to有什么区别?
答案
1,在表示一次性动作时,have to和 have got to 是可以互换的:I have (got) to be back by ten o’clock.我必须10点前返回来.I haven’t got to work tomorrow.我明天不必上班.I’ve got to do something!Langdon thought.兰登想:“我得做点什么!” 2,但是,当表示习惯性动作时,尤其是当句中含有表示经常性的副词(如always,often,sometimes等)时,则应使用have to ,而不使用have got to:I don’t usually have to work on Sundays.通常我再星期天不必工作.I often have to get up at 5.我常常必须五点起床.3,have to 与 have got to 的另一区别,就是后者不大用于过去时.They didn’t have to worry about money.他们那时不必为金钱而操心.I had to walk very fast to overtake you.为了赶上你,我不得不走得很快.4,最后一个区别,就是have to 前可加助动词或情态动词,或者用在进行体和完成体结构中,而have got to却不能:I shall have to help him as much as I can.我将不得不尽我所能去帮助他.He may have to cancel his plan.他也许不得不取消这个计划.People are having to boil their drinking water during this emergency.在这个紧急情况下,老百姓必须煮沸他们的饮用水.The administration has had to make unpopular decisions.行政部门不得不做出不得人心的决定.
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