不定式

　　1. 某些動(dòng)詞后要接不定式

　　某些及物動(dòng)詞后只能接不定式作賓語(yǔ)，其中最常用的動(dòng)詞有agree, afford, arrange, appear, ask, attempt, care, choose, continue, decide, demand, desire, determine, expect, fail, fear, forget, hate, hesitate, hope, intend, learn, like, love, manage, mean, neglect, offer, plan, prefer, prepare, pretend, promise, refuse, regret, remember, seek, tend, try, volunteer, want, wish等。

　　What do you plan to do tomorrow?

　　She hated to move from such a nice village.

　　In class teachers should try to get feedback from their students

　　2. 不定式的被動(dòng)式

　　不定式有被動(dòng)式，當(dāng)不定式的邏輯主語(yǔ)是這個(gè)不定式所表示的動(dòng)作的承受者，不定式要用被動(dòng)式，在句中可作主語(yǔ)，賓語(yǔ)，定語(yǔ)，狀語(yǔ)，復(fù)合賓語(yǔ)等。作定語(yǔ)時(shí)，通常表示在謂語(yǔ)動(dòng)作后將要發(fā)生的動(dòng)作。

　　The last question to be discussed today is how to do the job more efficiently.

　　She preferred to be given more difficult work to do.

　　3. 不定式的完成式

　　當(dāng)不定式的動(dòng)作發(fā)生在謂語(yǔ)動(dòng)詞的動(dòng)作之前，不定式要用完成式，在句中可作賓語(yǔ)，狀語(yǔ)以及構(gòu)成復(fù)合賓語(yǔ)，復(fù)合謂語(yǔ)。

　　She seemed to have heard about the news already.

　　He was believed to have been a very rich man.

　　4. 不定式的完成被動(dòng)式

　　當(dāng)不定式的邏輯主語(yǔ)是這個(gè)不定式所表示的動(dòng)作的承受者，且不定式的動(dòng)作發(fā)生在謂語(yǔ)動(dòng)詞的動(dòng)作之前，不定式要用完成被動(dòng)式，在句中可作主語(yǔ)，賓語(yǔ)或構(gòu)成復(fù)合賓語(yǔ)，復(fù)合謂語(yǔ)。

　　The forest fire is reported to have been put out last night.

　　It is supposed to have been finished without referring to any reference books.

　　5. 帶邏輯主語(yǔ)的不定式短語(yǔ)

　　不定式可以有邏輯主語(yǔ)，其構(gòu)成形式為“for +代詞的賓格(或名詞) +不定式”。 帶邏輯主語(yǔ)的不定式短語(yǔ)可在句子中作主語(yǔ)、賓語(yǔ)、表語(yǔ)或狀語(yǔ)等。

　　It is not easy for you to catch up with them in a short time.

　　I think it better for you to see the doctor.

　　What we want is for you to understand the matter clearly.

　　I sent him some pictures for him to see what Paris is like.

　　6. 帶疑問(wèn)詞的不定式短語(yǔ)

　　不定式前可以加某些疑問(wèn)代詞，如who、what、which,或疑問(wèn)副詞，如when、where、how、why等，構(gòu)成一種特殊的不定式短語(yǔ)，可在句子中作主語(yǔ)、賓語(yǔ)、表語(yǔ)或狀語(yǔ)等。

　　How to improve English is often discussed among the students.

　　We haven’t decided when to visit the place.

　　The most difficult thing in learning English is how to speak the language well.

　　You haven’t answered my question where to get these books.

　　7. 某些動(dòng)詞后的不定式作賓語(yǔ)補(bǔ)足語(yǔ)時(shí)，不定式不帶to，這些動(dòng)詞是feel, have, hear, let, make, notice, see, watch等。

　　Suddenly I felt the atmosphere in the room become tense.

　　I often hear them sing this song.

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