专业英语四级考试必备语法知识
语法题主要集中在虚拟语气是专业四级考试中每年的必考内容，下面，小编给大家整理了英语专四必备的语法知识，大家可以作为学习的参考。
1虚拟语气
常考“坚决要命”型、would rather型、high time型的虚拟语气和虚拟语气的倒装形式。“坚决要命”型指句子的主句中带有表达“坚持、决定或决心、要求、命令”等意义的词语，从句使用should型的虚拟语气。
例如：
It is essential that he examine all the facts first. (2014)
Had it not been for your advice, I would have made the wrong decision. (2016)
It's getting late. I'd rather you left now. (2011)
值得注意的是，近几年出现新的趋势：在考查语言结构的基础上，加入了对句子所表达的语气、程度和深层语义的检测。比如2016年的第20小题：
The sentence "I wish I had been more careful in spending money." expresses the speaker's _____.
A. hope B. joy
C. regret D. relief
2主谓一致
多年来侧重考察集合名词(如cattle，police，family，audience )、学科(如politics，physics, statistics)、时间、金钱、距离作为整体表示总量(如20 miles，5 dollars，30 minutes)、either...or，neither...nor的就近原则等几个方面的主谓一致。近年的考题加强了综合性，看是一个小题，却能考察一个语法现象的几个小点。
例如：
Which of the following statements is INCORRECT? (2015)
A. Five miles seem like a long walk to me.
B. Ten dollars was stolen from the cash register.
C. Either my sister or my brother is coming.
D. Only one out of six were present at the meeting.
3情态动词
情态动词对中国学生是一个难点，也是考察的重点。考察方式也从以往的选出正确的用词，提升到对情态动词所表达的内涵的深度理解。
例如：
Which of the following sentences express Willingness? (2012)
A. By now she will be eating dinner.
B. I shall never do that again.
C. You shall get a promotion.
D. My brother will help you with the luggage.
又如:
Which of the following sentences expresses a Fact?(2013)
Which of the following sentences indicates Possibility? (2014)
Sentence ___ expresses the highest degree of Possibility. (2016)
关于情态动词，建议关注should除了“应该”外，还常表示“竟然”和“万一”; shall可以用在第二、三人称后表命令、要求、规定和意愿;Shall we是提出suggestion，而Shall I...是提出offer;must表肯定的推测，can not表否定的推测。
4句法成分和语法概念
自2010年起，每年都会有几个题考察某个划线部分/斜体部分在句子中的所做的成分或者相互关系，所以考生要熟悉一些语法术语的英语表达，如subject，predicate，object，appositive，complement， adverbial of condition / concession / time，dynamic verb，stative verb，reflexive pronouns等。
例如：
Which of the following italicized parts indicates a predicate-object relationship? (2014)
A. He was reading Mary's letter in the room.
B. You can buy men's shoes in this shop.
C. Mrs. Blake's passport was lost.
D. The enemy's defeat brought the war to an end.
Which of the following italicized parts indicates a subject-verb relation? (2015)
A. The man has a large family to support.
B. She had no wish to quarrel with her brother.
C. He was the last guest to leave.
D. Mary needs a friend to talk to.
Which of the following is a stative verb? (2015)
A. drink B. close
C. rain D. belong
5限定词
限定词(determiners)也成为考察的热点，each，all, half，both，such，other，another，few，many，a bit等都在近年考题中出现。这些词看司空见惯，但是对它们在句子中的位置和使用的准确度，考生们仍有不扎实之处。
以上就是小编给大家分享的英语专四语法知识，希望可以给大家在备考的过程中带来帮助。
