情态动词 have to & must_夸克英语笔记

精讲课笔记随视频锁定

情态动词 have to & must

右侧笔记支持独立滚动。边听名师连读拆解，边对照右侧的语法事实与统计数据笔记。

have to ^不得不	must ^必须
必须做某事:强制或义务、规则、要求或他人的命令	必须做某事:内在的强烈愿望或个人判断、他人的建议、规劝、强调等
I have to finish this report by tomorrow. ^{(我必须在明天之前完成这份报告。)} He has to wear a uniform at work. ^{(他在工作时必须穿制服。)} We have to follow the instructions carefully. ^{(我们必须仔细遵循指示。)}	I must work harder to achieve my goals.^{(我必须更加努力地实现我的目标。)} You must take care of yourself.^{(你必须照顾好自己。)} We must remember to bring our passports when we travel. ^{(我们出行时必须记得带护照。)}
don't have to ^{不必要，没有强制性}	must not ^{禁止做某事，具有强制性}
You don't have to attend the meeting if you don't want to. ^{(如果你不想去的话，你不必参加会议。)}	You must not use your phone while driving. ^{(驾车时你不能使用手机。)}

时态变化

一般现在	have to	must
过去时	had to	must
三单	has to	must

have to	否定句 ^{助动词Do、Does、Did + not}	疑问句 ^{助动词Do、Does、Did}
have to	He doesn't have to wear a uniform at work.	Does he have to wear a uniform at work? ^{(他在工作时必须穿制服吗？)} Yes, He has to.

must	否定句 ^绝对禁止	疑问句 ^must提前
must	He mustn't wear a uniform at work.	Must he take care of himself? ^{(他必须照顾好自己吗？)} Yes, he must. Yes, he need to.