是助动词吧、协助主要动词构成谓语动词词组的词叫助动词（Auxiliary Verb）.被协助的动词称作主要动词（Main Verb）.构成时态和语态.助动词是语法功能词,自身没有词义,不可单独使用,它没有对应的汉译,例如：He doesn't like English.他不喜欢英语.（does是助动词,无词义；like是主要动词,有词义)最常用的助动词有：be,have,has,do,does,shall,did,will,should,would 它们表示时态,语态,构成疑问句与否定副词not合用,加强语气定义
最常用的助动词有：be,have,has,do,does,shall,did,will,should,would 它们表示时态,语态,构成疑问句与否定副词not合用,加强语气
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助动词
半助动词
协助主要动词来表达句子的时态和语态.
分类
半助动词
在功能上介乎主动词和助动词之间的一类结构,称为半助动词.常见的半助动词有be about to,be due to,be going to,be likely to,be meant to,be obliged to,be supposed to,be willing to,have to,seem to,be unable to,be unwilling to等.
情态助动词
情态助动词 1.情态助动词包括will(would),shall(should),can(could),may(might),must,need,dare,ought to,used to,had better后接原形不定词.2.情态助动词不受主语的人称和数的限制.3.两个情态助动词不能连用.中文:他将能够及时完成此事.(误)He will can finish it i.
基本助动词
基本助动词 基本助动词只有三个：be,do,have,它们没有词汇意义,只有语法作用,如协助构成进行体,完成体,被动态,否定句,疑问句等.例如 He is giving a lecture.他在作报告He has made a plan.他已经订了计划The small animals are kept in the cages.小动物都关在笼子里.
助动词协助主要动词完成以下功用
a.表示时态,例如：
He is singing.他在唱歌.
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He has got married.他已结婚.
b.表示语态,例如：
He was sent to England.他被派往英国.
c.构成疑问句,例如：
Do you like college life?你喜欢大学生活吗?
Did you study English before you came here?你来这儿之前学过英语吗?
d.与否定副词not合用,构成否定句,例如：
I don't like him.我不喜欢他.
e.加强语气,例如：
Do come to the party tomorrow evening.明天晚上一定来参加晚会.
He did know that.他的确知道那件事.
3） 最常用的助动词有：be,have,do,shall,will,should,would,did
具体用法
have的用法
一、have作助动词
形式
主要变化形式：have,has,had
动名词/现在分词：having
1）have +过去分词,构成完成时态,例：
He has left for London. 他已去了伦敦.
By the end of last month,they had finished half of their work.
上月末为止,他们已经完成工作的一半.
2）have + been +现在分词,构成完成进行时（现在完成时）,例：
I have been studying English for ten years.
我一直在学英语,已达十年之久.
3）have+been +过去分词,构成完成时态的被动语态,例：
English has been taught in China for many years.
中国教英语已经多年.
二、have作普通动词
形式
肯定式\x09否定式\x09疑问式
现在时\x09
have（got）或
have
haven't（got）或
don't have
have I（got）?或
do you have?
过去时\x09had\x09
hadn't（got)或
didn't have
had you（got)?或
did you have?
为表示习惯动作,do与have连用：
— Do you have earthquakes in your country?你们国家地震吗?
— Yes,but we don't have them very often.有,但不经常.
