一般现在时
一、构成:
1) 肯定形式:S+动词原形(v.)或 单三形式 (v.s/v.es)+O.
2) 否定形式:S+助动词do not/ does not+动词原形+O.
3) 疑问形式:助动词Do/Does +S.+动词原形+O.
例如:
I often help my parents do housework at home.
Tom often helps his parents do housework at home.
Sometimes Lucy washes her clothes herself.
二、用法:
1)表示经常性活习惯性的动作或存在的状态。
I often go to school by bike.
2) 表示客观事实或普遍真理。
The earth goes around the sun.
3)一般现在时表将来
a. 用在状语从句中(如 时间、条件状语从句等),用一般现在时表示将来。
If it rains tomorrow, we won’t go to the park. (if引导的条件状语从句,主将从现)
When I grow up, I will go to America.
b. 下列动词:come, go ,arrive, leave, start, begin, return的一般现在时表将来。主要用来表示时间上已经安排好的事情,如:
The train leaves at six tomorrow morning.
4) 在某些以here, there 开头的句子(倒装句)中用一般现在时表示正在发生的动作。
Here comes the bus. = The bus is coming.
三、与一般现在时连用的时间状语
1) 表示频度的副词 always, often, usually, sometimes等。
2)表频率的词组,如: once a year, twice a month, three times a week等。
3)表一般现在的时间状语如:on Sundays, on Monday afternoon, every day, every year 等。
四、形式 构成 例词
第三人称单数, 直接加-s runs, likes
以ch, sh, s, o ,x结尾的动词,在词尾加-es teach-teaches, wash-washes, go-goes, pass-passes, fix-fixes
以辅音字母加y结尾的动词,变y为i加-es study-studies, try-tries
以元音字母加y结尾的动词,直接加-s stay-stays, play-plays