没有Keep to do的用法，只有keep on doing sth和keep doing sth.
分析：keep原词义保持；经营；遵守；饲养。keep的过去式和过去分词都是kept.
keep on doing sth 一直反复做某事
She keep on raising her hand 她反复举手（不是一直举着手）
2.keep doing sth 一直持续做某事
She keep running 她一直在跑（没停过）
keep其他词义用法：
1.整理,料理
Mother keeps the house.
母亲料理家务.
2.履行;遵守;保守
Everyone must keep the law.
每个人都必须守法.
3.阻止,妨碍;控制住[(+from)]
Robbie couldn't keep the child from yelling.
拓展内容：关于动词加to do和doing的区别
remember to do记得要做某事但还没做
remember to buy a magazine
记得回来之后或者以后要买本杂志
remember doing是记得自己做过某事,是已经做了的事情,这是有一定区别的
remember buying a magazine
记得已经买过杂志了
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