英语与语法基础--时态.ppt
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（一）、一般现在时
（二）、现在进行时
（三）、一般将来时
（四）、一般过去时
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(一). 一般现在时
1. 基本意义：
1) 表示现阶段经常性、习惯性的动作或状态。如：
I go to school on foot.
The trees are green.
2) 表示个人爱好、习惯。如：
I like red and pink.
They hate to do lots of housework.
3) 表示客观真理或自然现象。如：
Leaves turn yellow in autumn.
Our teacher told us that water freezes below zero.
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2. 基本构成
1) 当表示习惯性的动作时，它的构成是：主语+实义动词+其它。
当主语是we, you, they或复数名词时，句子的谓语动词用原形。当主语是he, she, it,等时，动词要用第三人称单数。变换句型时，要用助动词do/ does。如：
She goes to bed late every day.
We dont clean our bedroom on Sundays.
Do you clean your bedroom on Sunday?
2) 当表示存在的状态时，它的构成是：主语+am / is / are+其它。变换句型时，要借助be动词。如：
Are Jim and Danny in China now?
Yes, they are. / No, they arent.
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3. 常用时间状语：
every day / month / year, on Sundays, in the morning / afternoon / evening, always, usually, often, sometimes, never, three times a week, every four days等。
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4. 注意问题：
一般现在时主要由动词原形表示，但第三人称单数后的动词词尾有所变化。第三人称单数动词词尾的变化有几种形式：
(1). 一般情况加-s (reads, says, takes)
(2). 以ch, sh, s, x, 或o结尾的词 加-es teaches, washes, goes, misses,
(3).以辅音字母加y结尾的词 变y为i再加-es studies, cries, carries
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同步练习
1. Mike sometimes __________(go) to the park with his sister.
2. At eight at night, she __________(watch) TV with his parents.
3. ________ Mike________(read) French e
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