英语助动词【be】【do】【have】详解

1、助动词：从字面意思来看就知道【助动词】的作用是辅助句中的【主要动词】的。了解助动词是怎样在句中起来辅助作用的，可以让你的英语语法上升一个台阶。因为助动词是如此的通用，常见。你可能随时随地都会要使用到它。

2、概要介绍：do：用于一般时态（simple tenses）be：用于进行时态（continuous tenses）have：用于完成时态（perfect tenses）一定要记好上述助动词各自的用途，它是英语语法中的黄金法则。

3、【be】【do】【have】作主动词：【be】【do】【have】也可以作为主动词使用，不要与它作用助动词时混淆了。如：She didn't do it. 她没有做。He is being annoying. 他真烦人。I have had six. 我有6个。

4、助动词要去主语匹配：如：He is playing. 他在玩耍。I am playing. 我在玩耍。They are playing. 他们在玩耍。

5、助动词作用：在肯定句中，助动词只是功能性的，没有具体的含义，因此可以缩写，发音上也可以简化。如：I'm playing with my friends. 我正在和朋友一起玩。He's taking his time. 他正在忙。I've bought you some fruit. 我给你买了些水果。在否定句中，一般与not连接缩写。He didn't like it. 他不喜欢它。

6、do：do / dose：现在时did：过去时do：+will / going to 用于将来时例：We do（一般要省略，不省略有强调的意思） eat meet on Fridays.They don't want to go.He doesn't eat meat.Did you like it?Doesn't Mike know about it?I will do it later.

7、be：am / are / is：现在进行时was / were：过去进行时be：用于将来时注意：主动词用ing形式。例：We are following your brother.I am trying to call him now.It isn't raining now.Is she bringing her friend?Aren't we taking Mike?He will be presenting at 6pm.Will you be going to work today?除了以上讲的以外，be还经常用于被动式：I was given five minutes to finish.

8、have：have / has：现在完成时had：过去完成时have：+will / going to用于将来时注意：主动词用过去分词形式。例：Mike has taken the car.We have tried it many times.He hasn't arrived yet.Have the brought the umbrella?We have been waiting for hours.He will have finished by 5pm.