專升本英語語法基本知識（不定式）

今天為大家繼續(xù)帶來了專升本英語語法（不定式）的基本知識，希望大家能夠堅(jiān)持每日打卡，一步一個腳印掌握相應(yīng)的語法知識點(diǎn)，堅(jiān)信付出終將有所收獲。

1.用法:主語、賓語、表語、賓語補(bǔ)足語、定語、狀語等。

eg:To see is to believe. (主、表)

It only took us a year to finish the work. (主，it形式主語)

She wants to play basketball this afternoon. (賓)

She was the first person to think of the idea. (定:主謂關(guān)系)

I have nothing to say on the problem. (定:動賓關(guān)系)

He asked me to help him. (賓補(bǔ))

We are all happy to hear of the good news.(狀)

◆不定式在let, have, make(讓,使)，see, look at, notice, hear, listen to, feel等后面作賓語補(bǔ)足語時to應(yīng)省略，在被動語態(tài)中to應(yīng)保留。

eg:The coach has the team practice hard every night in the past two years.

I saw a man come into the classroom and talk with the teacher.

We felt the house shake.

Someone was heard to come up the stairs.

◆在help后，不定式可以帶to也可以不帶to.

eg:Help me (to) get him to bed.

He help her lift the box.

He helped her to mount the bike

She was helped to lift the box.

◆當(dāng)不定式和其修飾的詞有動賓關(guān)系時，動詞如果是不及物動詞，后面就要有必要加介詞。

eg:There is nothing to worry about.

I need a pen to write with.

Give me some paper to write on.

2.不定式的邏輯主語

不定式前面可以加for引導(dǎo)的短語作邏輯主語，說明不定式表示的動作是誰做的，或不定式指的是誰的情況。

eg:It is important for us to master English.

It will be a mistake for us not to help them.

I open the door for her to come in.

3.不定式的否定式:not to do

不定式的被動式:to be done

不定式的完成式:to have done(不定式的完成式僅強(qiáng)調(diào)其動作發(fā)生在謂語動詞之前)

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