语法知识一般现在时,一般过去时,一般将来时,过去将来时,现在进行时,过去进行时,现在完成时,过去完成时,现在完成进行时就

一般现在时：
①be动词
主语+am/is/are
如:
I am
he/she is
they/you/we are
②行为动词
主语+do (动词原形) 如 :I often play football
He often plays football
二、一般过去时
①be动词
主语+was/were
②行为动词
主语+did (即动词过去式)
三、现在进行时：
基本结构：主语+am/is/are+doing
四、过去进行时：
基本结构：主语+was/were+doing
五、现在完成时：
基本结构：主语+have/has + done
六、过去完成时：
基本结构：主语+had + done
七、一般将来时：
基本结构：①主语+ am/is/are/going to + do
②主语+ will/shall + do.
八、过去将来时：
基本结构：①主语+was/were/going to + do；
②主语+would/should + do.

1、一般现在时
主要用来表示人、事物的现在状况和特点；表示经常或习惯性的动作，句子中常有often, always, from time to time 等时间状语； 表示客观规律和永恒真理等。
He usually goes to work at 7 o’clock every morning.
She has a brother who l...

I am a student
I was a student 10 years ago
I will be a teacher when I grow up
I am doing my homework
I was doing my homework this time yesterday
I have been to china for many times
I had been a teacher before I had a son

现在进行时由be(am/is/are)+动词的ing形式(动词原形+ing)构成
一般现在时由主语(I/you/he/she...)+动词原形（注意第三人称单数要加s）构成
一般过去时的谓语动词用过去式
而现在完成时的谓语基本构成是“助动词have /has +过去分词

一般现在时 do
一般过去时 did
一般将来时 will do
be going to do
过去将来时 would do
现在进行时 be doing
过去进行时 was/were doing
现在完成时 have done
过去完成时 had done
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