一般现在时英语语法大全
一般现在时
A、当谓语是be动词时，构成为：主语+be动词( am, is, are )+其他。
如：I am a student.
B、当谓语是行为动词时，构成有两种：
(1)主语(非第三人称单数)+动词原形+其他。
如：We often watch TV at the weekends.
(2)主语(第三人称单数)+动词第三人称单数形式+其他。
如：Jim usually goes to the park on Sundays.
C、句型变换：
肯定句、否定句、一般疑问句及回答
They watch TV at six every day.
They don’t watch TV at six every day.
Do they watch TV at six every day?
Yes, they do. / No, they don’t.
She watches TV at six every day.
She doesn’t watch TV at six every day.
Does she watch TV at six every day?
Yes, she does. / No, she doesn’t.
一般现在时的用法
1) 经常性或习惯性的动作，常与表示频度的时间状语连用。
时间状语： every…, sometimes, at…, on Sunday
I leave home for school at 7 every morning.
2) 客观真理，客观存在，科学事实。
The earth moves around the sun.
Shanghai lies in the east of China.
3) 表示格言或警句中。
Pride goes before a fall. 骄者必败。
注意：此用法如果出现在宾语从句中，即使主句是过去时，从句谓语也要用一般现在时。
例：Columbus proved that the earth is round..
4) 现在时刻的'状态、能力、性格、个性。
I don't want so much.
Ann Wang writes good English but does not speak well.
【比较】
1. Now I put the sugar in the cup. 2. I am doing my homework now.
第一句用一般现在时，用于操作演示或指导说明的示范性动作，表示言行的瞬间动作。再如：Now watch me, I switch on the current and stand back. 第二句中的now是进行时的标志，表示正在进行的动作的客观状况，所以后句用现在进行时。
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