是be busy doing sth还是be busy to do sth?

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• abandon用法abandon oneself to sth纵情于某事那abandon doing sth是放弃做某事,还是纵情于某事.
• 英语翻译下面这个句子看起来简单,可是很难翻译Most people don't live to see 100.句中live的用法,是不是live to do sth.还是“live to see +数词”是固定用法?
• ——Where is Alice?——I think she is in the dormitory.I saw her __接着 ：(pass) our classroom just now .② We must keep the classroom ____ (clean).Because we're going to have an English party tomorrow.都是根据 适当形式填空其实挺简单的就是忘了知识点 不知到底是 see sb to do sth还是see sb do sth ② keep sth clean 还是keep sth to clean还是 keep sth cleaning
• My mother told me (not to swim)in the river 为什么是not to do sth而不是not doing或not do呢?
• 被动语态后接动词不定式为什么是be allowed to do sth 而不是be allowed doing英语中有allow to do 和doing两种么
• 最好做某事到底是would better do sth 还是had better do sth?
• be busy with sth.spend on sth.be busy doing sth.spend doing sth.keep on dong sth mind doing sth这一些总称什么,这些东西是规定的吗?介词也是吗?如
• write doing sth还是write to do sth
• would you like doing sth.还是to do sth.
• 有没有continue sth. 的用法（不谈continue to do/doing）?还是必须要continue with sth. ?
• be busy doing sth 和be busy to do sth 的区别
• 忙于做某事为什么要用be busy doing sth 可以用be busy to do sth吗为什么不能用to do啊