have to的用法小結(jié)
have to的用法小結(jié)
以下是小編為大家整理的have to的用法,希望大家能好好掌握have to的用法,提高英語水平。
have to 是一個比較特殊的情態(tài)習(xí)語,雖然也具有情態(tài)動詞的功能,但卻與其他的情態(tài)動詞不同。它有人稱、數(shù)和時態(tài)的變化,其否定式和疑問式的構(gòu)成方式也與情態(tài)動詞不一樣。同學(xué)們在使用have to 時必須弄清它的真面目,否則容易出錯。
一、have to 與其他情態(tài)動詞一樣也是后接動詞原形,表示外界的強(qiáng)制作用,強(qiáng)調(diào)被迫性。含有不情愿的色彩,常譯為“必須,不得不”。
二、have to 可用于多種時態(tài),而且不同時態(tài)使用不同的形式:一般現(xiàn)在時中,主語為第三人稱單數(shù)時用has to ; 一般過去時中,用 had to。 have to 還可以用在其他的情態(tài)動詞之后。例如:
She has to look after her little sister.
她不得不照顧她的小妹妹。
I have to do some washing.
我必須洗洗衣服。
I had to do my homework last night.
昨晚我不得不做作業(yè)。
I think he may have to help his Dad in the garden.
我想他可能不得不在花園里幫他爸爸。
三、have to 的否定式和疑問式一般要借用助動詞do的適當(dāng)形式構(gòu)成。have to 的否定式是don’t have to; has to 的否定式是doesn’t have to; had to 的否定式是didn’t have to。have to的疑問式同樣也借用助動詞do的相應(yīng)形式構(gòu)成。例如:
He doesn’t have to do the homework now.
他沒有必要現(xiàn)在做作業(yè)。
—Do I have to go there now?
我現(xiàn)在就得去那兒嗎?
—Yes, you do. (No, you don’t have to.)
是的,你必須去。(不,你不必。)
We didn’t have to answer the question yesterday.
昨天我們沒有必要回答這個問題。
注:情態(tài)習(xí)語是助動詞、不定式或副詞的組合。
四、翻譯下面的句子。
1.我們必須自己動手去做。
2.瑪麗必須在英語學(xué)習(xí)上努力嗎?
3.上周日他不得不早起。
4.你沒必要為你的功課擔(dān)心。
5.彼得很累,不得不坐下來休息一會兒。
6.昨天他不得不待在家里。
7.他不得不跑回學(xué)校取他的作業(yè)本。
8.你必須早些離開嗎?
9.我沒必要躺在床上。
10.我們必須認(rèn)真聽老師講課。
keys:
1. We have to do it ourselves.
2. Does Mary have to study hard at English?
3. He had to get up early last Sunday.
4. You don’t have to worry about your lessons.
5.Peter was very tired and he had to sit down and have a rest.
6. He had to stay at home yesterday.
7.Hehad to run back to school to get his exercise-books.
8. Did you have to leave early?
9. I don’t have to stay in bed.
10.We have to listen to the teachers carefully.
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