一、一般现在时
结构：主语 + 谓语动词（实义动词或者是be动词） + 宾语
当主语是第三人称单数的时候,后面的谓语动词一定要变成动词的第三人称单数形式.
例：He has an English book.句子中的 have 是动词原形,has则是have的第三人称单数形式二、现在进行时
结构：be + v+ing + sth
be动词包括（am is are) 什么情况用哪个be动词是由主语决定的!
当主语是第一人称“ I ” 的时候 be 动词一定只可以用 am
当主语是单三的时候,be 动词要用 is
当主语是第二人称 you 或者是其他的时候,be动词一定要用 are
v+ing 表示的是现在分词,也就是动词的ing 形式
现在分词的变化形式:
1.动词是以字母“e ”结尾的要去掉 e 再+ ing
2.直接在动词词尾 +ing
3.词尾是以一个元音字母加上一个辅音字母,且重读闭音节结尾的要双写辅音字母再 +ing
例：play- playing take - taking
do - doing leave - leaving
put - putting cut - cutting
例：I am playing football with my classmates.
He is watching TV at home.
They are having an English class.
三、一般将来时
1.结构：be + going to +do sth
例：I am going to do my homework tomorrow.
He is going to babysit his sister.
We are going to go shopping this weekend.
2.will + v（原形）
例：He will come back later.
I will visit my grandparents next week.
3.be + doing sth
现在进行时也可以表示计划、打算要做的事情
例：I am leaving for Shanghai next Sunday.
四、一般过去时
结构：主语 + 动词过去式 (be 动词,或者实义动词) + 宾语
例：I was a little girl 10 years ago.
He went to the Great Wall last month.
I visited my cousins last Saturday.