46、八大时态 (13-1)

一．一般现在时

1. 结构

肯定句式: 主语+动词原形/动词的第三人称单数+其他

否定句式: 主语+（助动词） don't/doesn't +动词原形+其他

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+do/does not

缩写形式: don't = do not doesn't = does not

例句：He often goes swimming in summer.

I usually leave home for school at 7 every morning.

2.用法

1）表示经常的、习惯性的动作或存在的状态，常与表示频度的副词连用。

常用的频度副词有： always、often、 usually、seldom、never、sometimes, every week (day, year, month…), once a week, on Sundays.频度副词在句中通常放在行为动词之前，系动词、助动词之后。

例如: He often goes swimming in summer.

I usually leave home for school at 7 every morning.

2）表示主语具备的性格、特征和能力等。

例如：All my family love football .

My sister is always ready to help others .

Ann writes good English but does not speak well.

3)表示客观真理、客观存在、自然现象。

例如：The earth moves around the sun.

　 Shanghai lies in the east of China.

4）表示按计划或安排好的，或将要发生的动作，可用一般现在时表将来。

但只限于start,begin,leave,go,come,arrive,return,take place等。

例如：The train leaves at six tomorrow morning.

He comes back tonight.

5）在复合句中，当主句是一般将来时，时间或条件状语从句的谓语动词只能用一般现在时来表示将来要发生的动作。

例如： I'll tell him the news when he comes back.

If you take the job , they will talk with you in greater details.

二．一般过去时态

1. 结构

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