【一般现在时的结构】1、主系表(名词、形容词、介词短语)
be动词的一般现在时有三种形式， 即：am, is, are 。
肯定句
I am a middle school student. 表身份（表语为名词）
I am really tired. 表状态（表语为形容词）
I am from Korea. 表处所 （表语为介词短语）
否定句：系动词后加 not
一般疑问句：系动词置于主语前， 句号变问号 。
缩写: we are=we're they are=they're
you are=you're aren't=are not
he is=he's my mother is=my mother's
isn't=is not that's=that is
注意：This is不可缩写 。 am not不缩写 。
2、主谓宾
肯定句式: 主语 动词原形/动词的第三人称单数 其他
I want to see you.
Bill often goes to school at 7:00 in the morning .
否定句式: 主语 （助动词）don't/doesn't 动词原形 其他
I don't want to see you.
Bill doesn't often go to school at 7:00 in the morning.
一般疑问句式: Do/Does 主语 动词原形 其他?
简略回答: (肯)Yes, 主语 do/does (否)No, 主语 don't/ doesn't
缩写形式: don't=do not doesn't=does not
Do you want to see me? Yes, I do. /No, I don't
--Does Bill often go to school at 7:00 in the morning?
--Yes, he does. /No, he doesn't.
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