1 英語中助動詞do /does 的用法如下:

顧名思義，所謂助動詞就是幫助行為動詞構成各種否定、疑問、時態的動詞就稱為助動詞，其沒有詞義，只有語法意義。在一般現在時中，主語為三單形式，行為動詞作謂語時，須用行為動詞第三人稱單數形式，變為否定句及疑問句時，就必須藉助助動詞does, 原來第三人稱單數形式的行為動詞就應還原為動詞原形。如:

He likes apples.

否定句: He doesn"t like apples.

一般疑問句: Does he like apples?

肯定及否定回答: Yes, he does. /No, he doesn"t.

在一般現在時中，如果主語不是三單形式，行為動詞用原形，變為否定句及疑問句時，就用助動詞do 。如:

They often play soccer after school.

否定句:They don"t often play soccer after school.

一般疑問句: Do they often play soccer after school?

肯定回答及否定回答:

Yes, they do. /No, they don "t.

2 be (am, is are )的用法如下:

請記住口訣

我用am, 你用are

is 連著他/她/它

單數名詞用is

複數名詞全用are

變疑問往前提

句未問號莫忘記

變否定更容易

be 後not 別丟棄

否定疑問任你變

句首大寫莫遲疑 如:

I am not a student. (否定句)

He is not from America. (否定句)

They aren"t at home. (否定句)

Are you 14 years old? (一般疑問句)

Yes, I am. /No, I "m not.

Is she in Class 3，Grade 9?（一般疑問句）

Yes, she is. /No, she isn"t.

Am I cool ? Yes, you are. /No, you aren"t .