1.为什么一句话中如：She plays sports every day.But he doesn't play sp

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1.为什么一句话中如：She plays sports every day.But he doesn't play sports---he only watches them on tv.怎么前一句play有s,后一句就没有了?
2.什么时候在动词后该加s?
3.I need 和I want 后面是不是动词都加ing或之前加to啊?

1前一个是陈述句所以要用第三人称单数主语是第三人称动词就要加s 或es
后一个是否定句 does做助动词喽~
反正说明白点就是有does 的地方动词就不要加s
比如说否定句he doesn't play sports】
疑问句does he play sports
2第三人称单数时就要加s
第三人称（he she it)
need:
“need”既可以作情态动词,也可以作实义动词
情态动词就是直接加原形了呗
“need”作为实义动词时,通常用法是：
人＋need ＋to do
物＋need ＋doing
物＋need ＋to be done
“need”后还可以直接跟名词
The flowers need watering．这些花需要浇水
want一般情况下都是加to do

1.为什么一句话中如：She plays sports every day.But he doesn't play sp He doesn't （play.plays)sports She plays sports every day He plays sports every day.He does sports every day.She does She play sports every day She ____（play） sports every day.横线上用 play 还是 plays啊? But he doesn't play sports 为什么play不加s（play不是第三人称加s吗)?为什么spor [ ]he doesn't play sports 1.She plays sports every day.改为一般疑问句 she plays sports ()school every day He plays basketball every day. play为什么加s sue plays sports every day 为什么plays sports加s