导读:英语对MBA考研的重要性不言而喻。英语是不少考生们都头疼的科目,单词多、语法多、长难句多。为了帮助2020考研er在准备阶段更好的积累语法知识,今天小编为大家说一说考研英语语法知识点时态。

动词的时态=时+态.“时”指动作或状态所发生的时间,分为现在、过去、将来、过去将来四种.“态”指动作进行的状态,分为一般、进行、完成或完成进行四种.
 
一、时态的变化
 
1.文中出现时态变化
 
(2008,text2)第一段首句:It used to be so straightforward.A journal editor would then remove the authors’names and affiliations(关系)from the paper and send it to their peers for review.
 
第二段首句:No longer.The Internet...is making access to scientific results a reality.
 
2.题中出现时态变化
 
(2006,text 2)Stratford cries poor traditionally.Nevertheless every hotel in town seems to be adding a new wing or cocktail lounge.
 
28.By saying“Stratford cries poor traditionally”(Line 2-3,Paragraph 4),the author implies that________.
 
[A]Stratford cannot afford the expansion projects
 
[B]Stratford has long been in financial difficulties
 
[C]the town is not really short of money
 
[D]the townsfolk used to be poorly paid
 
【答案】C
 
二、虚拟语气
 
虚拟语气用来表示说话人的主观愿望或假想,而不表示客观存在的事实,所说的是一个条件,不一定是事实,或与事实相反.虚拟语气常见的表达形式和考查方式如下文.
 
1.表示与现在事实相反
 
从句:If主语+过去时
 
主句:主语+should/would/could/might+do
 
If I were a bird,I could fly high.
 
常见变体:if省略,句子倒装
 
例:Were I a bird,I could hardly fly high.
 
2.表示与过去事实相反
 
从句:If主语+had+done
 
主句:主语+should/would/could/might+have done
 
例:You should have known better than to make such a ridiculous mistake.
 
你不至于糊涂到这个地步犯这种荒谬的错误啊.
 
三、语态
 
动词的语态包括主动语态和被动语态.在主动语态中,主语是动作的执行者或状态的主体;在被动语态中,主语是动作的承受者,主语和谓语动词之间是被动关系.由于在被动语态中,主语相当于谓语动词的逻辑宾语,所以只有及物动词可以用被动语态,而不及物动词没有被动语态.
 
被动语态的构成为:系动词+过去分词.如果要说明动作发出者,则由介词by引出,置于动词的过去分词之后.被动语态的时态变化由系动词加以体现.
 
例:
 
They will open a new supermarket there soon.→A new supermarket will be opened there soon.
 
The doctor gave two lectures in English.→Two lectures were given by the doctor in English.