一般現在時
A、當謂語是be動詞時，構成為：主語+be動詞( am, is, are )+其他。
如：I am a student.
B、當謂語是行為動詞時，構成有兩種：
(1)主語(非第三人稱單數)+動詞原形+其他。
如：We often watch TV at the weekends.
(2)主語(第三人稱單數)+動詞第三人稱單數形式+其他。
如：Jim usually goes to the park on Sundays.
C、句型變換：
肯定句、否定句、一般疑問句及回答
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.
一般現在時的用法
1) 經常性或習慣性的動作，常與表示頻度的時間狀語連用。
時間狀語： every…, sometimes, at…, on Sunday
I leave home for school at 7 every morning.
2) 客觀真理，客觀存在，科學事實。
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. 驕者必敗。
注意：此用法如果出現在賓語從句中，即使主句是過去時，從句謂語也要用一般現在時。
例：Columbus proved that the earth is round..
4) 現在時刻的`狀態、能力、性格、個性。
I don't want so much.
Ann Wang writes good English but does not speak well.
【比較】
1. Now I put the sugar in the cup. 2. I am doing my homework now.
第一句用一般現在時，用於操作演示或指導說明的示範性動作，表示言行的瞬間動作。再如：Now watch me, I switch on the current and stand back. 第二句中的now是進行時的標誌，表示正在進行的動作的客觀狀況，所以後句用現在進行時。
