She has to b____ her sister请问横线上是填 babysit 还是 babysits 还是 babysitting

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She has to b____ her sister请问横线上是填 babysit 还是 babysits 还是 babysitting
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She has to b____ her sister请问横线上是填 babysit 还是 babysits 还是 babysitting
She has to b____ her sister
请问横线上是填 babysit 还是 babysits 还是 babysitting

She has to b____ her sister请问横线上是填 babysit 还是 babysits 还是 babysitting
babysit
不定式 to 后面接动词原形

babysit,用原形

babysit
have to +原形

babysit
have to 不得不,后面跟动词原形

babysit 动词 照顾婴儿
have to do 不得不做某事 所以填动词原形
babysits是第三人称单数 不是原型
babysitting是现在进行时

babysitting
因为babysit在这里做动词 但是它本身是名词 所以用babysit的现在分词充当动词

babysitting
ing结尾表示一种状态。而另外两种不存在这样的语法。

“has to”相当于“must”,它们都有“必须”的意思,前者一般指客观因素,后者则是主观的,后面接动词原形。