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【档案一】have to的意思是“不得不;必须”,后接动词原形。例如:My pen is broken.I have to buy a newone.我的钢笔坏了,我得买一支新的。【档案二】have to有人称、数和时态的变化,其第三人称单数形式为has to,过去式为had to。例如:His mother is ill.He has to stay at hometo look after her.他妈妈病了,他得呆在家里照顾她。Li Lei said he was so busy last night thathe had to work till11o’clock.李雷说他昨晚太忙了,一直工作到11点钟。【档案三】含有have to,has to,had to的句子需分别借助助动词do,does,did构成疑问句和否定句。例如:(1)They have to go home now.他们得现在回家。→Do they have to go home now?他们得现在回家吗?→They don’t have to go home now.他们不必现在回家。(2)She has to visit her ... 相似文献
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