语法是考研英语的基础，这部分在硕士研究生英语考试中不再单独考查，但是语法知识贯穿在整个英语考卷的各个题型中。考研英语完型填空题会直接考查语法知识;考研英语阅读理解题和英译汉中有大量的长难句，这些句子只有具备一定的语法知识才能正确分析;考研英语作文中要写出正确无误的句子，也需要语法知识。这部分基础如果欠缺，其它的综合能力提高起来将会很慢，所以所有考生都务必重视考研语法的复习。下面新东方在线考研频道为大家分享：“2021考研英语语法基础知识点讲解：不定式”。

　　1. 某些动词后要接不定式

　　某些及物动词后只能接不定式作宾语，其中最常用的动词有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. 不定式的被动式

　　不定式有被动式，当不定式的逻辑主语是这个不定式所表示的动作的承受者，不定式要用被动式，在句中可作主语，宾语，定语，状语，复合宾语等。作定语时，通常表示在谓语动作后将要发生的动作。

　　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

　　当不定式的动作发生在谓语动词的动作之前，不定式要用完成式，在句中可作宾语，状语以及构成复合宾语，复合谓语。

　　She seemed to have heard about the news already.

　　He was believed to have been a very rich man.

　　4. 不定式的完成被动式

　　当不定式的逻辑主语是这个不定式所表示的动作的承受者，且不定式的动作发生在谓语动词的动作之前，不定式要用完成被动式，在句中可作主语，宾语或构成复合宾语，复合谓语。

　　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. 带逻辑主语的不定式短语

　　不定式可以有逻辑主语，其构成形式为“for +代词的宾格(或名词) +不定式”。 带逻辑主语的不定式短语可在句子中作主语、宾语、表语或状语等。

　　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. 带疑问词的不定式短语

　　不定式前可以加某些疑问代词，如who、what、which,或疑问副词，如when、where、how、why等，构成一种特殊的不定式短语，可在句子中作主语、宾语、表语或状语等。

　　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. 某些动词后的不定式作宾语补足语时，不定式不带to，这些动词是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.

　　以上就是为大家分享的“2021考研英语语法基础知识点讲解：不定式 ”文章，考研英语语法复习起来应该有所侧重，必须有针对性，否则死扣考研英语语法，不但浪费时间，也不一定能有很好的效果。提醒考生在复习语法过程中要注意以下几个方面：有一本正规的语法书、重点掌握句法、以真题为依托。希望大家能在考研英语中考出高分。