什么是一般现在时
一般现在时是英语中最基础的时态。它表示：
- 经常做的动作：I go to school every day.
- 事实或真理：The sun rises in the east.
- 现在的状态：She is happy.
一、be动词的一般现在时
肯定句
- I am a student.
- He/She/It is tall.
- You/We/They are friends.
否定句（在be动词后加not）
- I am not tired.
- He is not a teacher.
- They are not at home.
缩写：isn’t, aren’t
一般疑问句（把be动词提到最前面）
- Are you a student? 是的，我是。
- Is she your sister? 是的，她是。
- Are they in the park? 不，他们不在。
二、实义动词的一般现在时
肯定句
- I/You/We/They + 动词原形
- I like apples.
- They play football on Sundays.
- He/She/It + 动词-s/es
- He likes apples.
- She plays the piano.
否定句
- I/You/We/They + don’t + 动词原形
- I don’t like cats.
- He/She/It + doesn’t + 动词原形
- He doesn’t like cats.
一般疑问句
- Do + I/you/we/they + 动词原形？
- Do you like cats? Yes, I do.
- Does + he/she/it + 动词原形？
- Does he like cats? No, he doesn’t.
三、第三人称单数的变化规则
动词加 -s 或 -es 的规则：
- 一般情况直接加 -s：like → likes, play → plays
- 以 s/x/sh/ch/o 结尾加 -es：go → goes, watch → watches
- 辅音字母+y 变 y 为 i 加 -es：study → studies, fly → flies
- 特殊变化：have → has
四、时间标志词
一般现在时的常用时间标志词：
- every day / every week / every month
- always / usually / often / sometimes / seldom / never
- on Sundays / on Mondays
- in the morning / in the afternoon
例子：
- I always get up at 7 o’clock.
- She often reads books in the evening.
- They sometimes play basketball on weekends.
五、常见错误
- 第三人称单数忘记加-s：He like apples. → He likes apples.
- 否定句用错形式：He doesn’t likes. → He doesn’t like.
- 疑问句忘记用Does：Does he likes? → Does he like?
- be动词和实义动词同时出现：I am like apples. → I like apples.
- 忘记时间标志词：I go to school.（最好加上every day等）
常见问题
什么时候用does提问？
当主语是he/she/it或单数名词时，用does提问。注意用了does后，动词要恢复原形。
第三人称单数总是忘记加-s怎么办？
每次写句子时先看主语是谁。如果是he/she/it/人名，就要在动词后加-s或-es。养成习惯就好了。
一般现在时和现在进行时有什么区别？
一般现在时：经常做的事（I read every day.） 现在进行时：正在做的事（I am reading now.） 判断方法：看句中有没有now / at the moment / Look! 这类词。