4. 一般现在时：
肯定句：1.主语+do, 2. 主语第三人称单数+ does
否定句：1.主语+don't+do 2.主语第三人称单数+doesn't+do
疑问句：1.Do+主语+do? 2.Does+主语第三人称单数+do?
时间状语：usually, sometimes, often, seldom, never, every day
动词第三人称单数变化规律1.直接加s,es,2. 某些y-i加s,es
例题：
1.My mother ____(work) in a primary school and I ____ (study) in the sameschool.
2.I ____ (have) a bike and Ben ____ (have) a bike, too.
3. My sister ____ (be) a pupil. She ____ (study) very hard.
4. Who ___ (cook) breakfast for your family?
5. My father is a teacher. He ____ (teach) Chinese in a primary school.
6. He ____ (be) strong. He can ___ (carry) the heavy box.
7. John ____ (go) to school by bike every day.
8. Kate often ___ (play) table tennis with her friends.
9. My mother often ___ (go) shopping and ___ (buy) some vegetbales in themarket.
10. --- Who ____ (study) hardest in your class?
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