1. 祈使句表示命令、禁止、祈求、愿望等,通常以动词原形开头。
Don't smoke in public.
please be careful when you go across the road.
2. doing开头一般来说 是动名词做主语,位于句首,谓语动词要用单数。
Playing on the beach is a pleasant thing for me.
Doing exercise every day makes us healthier and healthier.
3. does开头的句子常见于一般疑问句。
Does your brother like physical activities?
Does learning English make you happy?
是的
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