初中英语各个用词法及时态与语法！！急需！！!

1．一般现在时：
(1)表示客观真理，科学事实，格言或其他不受时间限制的客观存在。
eg: The earth moves around the sun.
(2)表示现在经常或习惯性的动作
eg: She speaks very good English.
I get up at 12:00 every day.
(3)表示事先已经计划安排的将要发生的动作或状态，主要用于come, go, start, begin, leave等动词。
eg: The new TV play begins at 20:00 tonight.
The train leaves early in the morning.
(4)在时间，条件，让步状语从句中，代替将来时。民间称为“主将从现”
eg: I will pick you up if it doesn’t rain tomorrow.
2.一般过去时:表示过去某一时间发生的动作或所处的状态.
一般过去时由动词的过去式构成.常跟有过去的时间状语,或是一个从句.一般过去时表示的动作或状态可能只限于一次,也可能是经常性的.
eg: We bought the present yesterday.
At that time she spoke very good English.
He came to the library twice a week.
例题1. On Saturday afternoon, M rs Green went to the market, ____ some bananas and visited her cousin.
A. bought B. buying C. to buy D. buy
例题2. -Nancy is not coming tonight.
-But she ____ !
A. promises B. promised C. will promise D. had promised
3.一般将来时:表示将来某