have_to的用法txt

1、have to 用法分析have to是情態(tài)動詞，意思是“必須；不得不”，表示客觀要做的事情，后接動詞原形。一、have to的單數(shù)和復(fù)數(shù)have to雖是情態(tài)動詞，但有人稱或數(shù)的變化。一般現(xiàn)在時第三人稱單數(shù)用has to，其他人稱用have to。例如：You have to go with Tom你得跟湯姆去。She has to answer this question. 她不得不回答這個問題。二、have to的肯定式have to的肯定式由“have to+動詞原形”構(gòu)成。例如：I have to tell him the news.我得告訴他這個消息。She has to walk

2、 home她不得不走回家。三、have to的否定式have to的否定式由“dont have to+動詞原形”或“doesnt have to+動詞原形”構(gòu)成。例如：You dont have to do like this.你不必這樣做。He doesnt have to be there on time. 他不必按時到那里。have to的否定式還可在havehas后面加not （僅限于一般現(xiàn)在時和一般過去時）。例如：He hasnt to go there.他不必去那里。I havent to get up early.我不必早起床。四、have to的疑問式have to的一般疑問

3、式通常由“Do/ Does + 主語+have to+動詞原形+其他成分”構(gòu)成，肯定回答用do或does；否定回答用dont（have to）或doesnt（have to）。例如：Do you have to go now?你現(xiàn)在就得去嗎？Yes, I do.是的。Does he have to stay home? 他必須留在家里嗎？Yes, he does. 是的。（No, he doesnt (have to) . 不，他不必留在家里。五、have to的時態(tài)have to可用于各種時態(tài)。其一般過去時的肯定式是had to，否定式是didnt have to；一般將來時的肯定式是wil

4、l have to，否定式是wont have to。例如：He said he had to see me about something important他說他有重要的事情不得不見我。He said they didnt have to borrow 200 yuan from John他說他們不必向約翰借二百元。You will have to do that again你得重做那件事。She wont have to go with you. 她不必跟你去。六、have to與 must的區(qū)別1. have to有人稱和數(shù)的變化，即第三人稱單數(shù)用has to，其他人稱用have to；而must沒有人稱或數(shù)的變化。例如：He has to go there他必須去那里。She must be off now她現(xiàn)在必須走了。2. have to有時態(tài)的變化，must沒有。例如：He told me that I must be at the station by ten他告訴我必須十點前到達(dá)車站。He had to pay for it他不得不賠償。3. have to強(qiáng)調(diào)客觀上“不得不”做某事；must指主觀上“必須”做某事。例如：We must study hard我們一定要努力學(xué)習(xí)。He had t