自考英语语法英文文法的最基本规则（三）

　　【导读】英语是山东自考本科专业必须要考的一门课程，很多山东自考考生对于英语科目是比较抵触的，尤其是英语是弱项的考生，对于如何去复习英语可能有些摸不着头脑，山东自考网的小编为大家总结了一些英语语法学习方法，快一起看下去吧。

必须注意 英文中有很多动词都是助词动，在规则（４）中，我们说在绝大多数的否定语句中，必须用助动词do或did。Do是原形动词，did 和does都是do的变形。
除了do是助动词以外，can、may、might、will、would、must也都是助动词。
以上所提到的助动词，都有一个共同的特色，那就是这些助动词后的动词必须是原形动词，以下的句子都是正确的：
He can swim.
He does not swim.
I do not speak English.
You must walk to work every day.
I did not work yesterday.
You may leave now.
I will go to Taipei tomorrow.
以下的句子都是错的：
＊ I did not went.
＊ He does not goes to work.
＊ You must walked to work.
除了以上的助动词以外，还有一个非常特殊的助动词，那就是have，在这个助动词的后面，动词绝对不能用原形动词，以下是用这个助动词的例子：
I have been to England.
I have slept all day.
I have studied English since I was a child.
been、slept 和studied都是过去分词（past participle），以下的句子也都是现在完成式，我们后讨论完成式的时候，会将这些解释清楚的。

我们先看看以下的英文句子，这些都是错的：
＊ How many books you wrote？
＊ How many sons you have？
正确的句子是：
Why do you drink so much water？
How many books did you write？
How many sons do you have？
绝大多数的英文问句子是一定要有助动词，以下全是正确的英文问句，你可以看出每一句的助动词吗？
Do you love me？
Did you go to school yesterday？
How many books do you have？
How much money does he have？
Why don’t you go back home？
Do you like to swim？
Can you play violin？
Will you go home tomorrow？
Would you give me a call？
当然啦，一旦动词是verb to be，我们又不需要助动词了，以下都是正确的英文问句：
Are you a teacher?
Is he a student?
Is Mr. Chang your father?
Were your mother and father in England last year?