①Theysharedeverything,talkedabouteverythingandkeptnosecretseachother.我填了to,认为是“对彼此没有秘密”,可是答案是from.keep...from...的结构有像这样的用法吗?我只见过像Ikeptthechildrenfromgoingo

Question

①They shared everything,talked about everything and kept no secrets ___ each other.我填了to,认为是“对彼此没有秘密”,可是答案是from.keep...from...的结构有像这样的用法吗?我只见过像 I kept the children from going out.这种用法啊.from后面应该跟什么成分呢?这整句话又要如何翻译呢?
②behind one's ability是指某人能做到还是不能做到?
③It should be made clear (of) to kids that it is impolite to speak when the mouth is full of food.
This should be made clear (of) to kids:it is impolite to speak when the mouth is full of food.
这两句话中的of到底要不要加?（分别解释）
第二句话表达上有没有什么错误?

Answer 1

①They shared everything, talked about everything and kept no secrets ___ each other.我填了to,答案是from.不过这与keep...from...的结构 无关 这是 介词短语 作定语 修饰 secrets
这句话意思是 他们分享并谈论每一件事情 并且没有彼此的秘密 ②behind one's ability需要 有语境 才能 判断.
平常 用的是 beyond one's ability是指某人不能做到
③It should be made clear (of) to kids that it is impolite to speak when the mouth is full of food. This should be made clear (of) to kids: it is impolite to speak when the mouth is full of food.这两句话中的of不要加
因为 clear是 主补 to kids 已经是介词短语 作状语 如果加 of 则 of 后面 缺宾语 第二句话 没有错误
再如
3. Be sure to make this point clear to everyone.
务使大家明了这一点.
来自《现代汉英综合大词典》
4. We deem it necessavy to make this clear to you.
这件事我们认为有必要跟你们说清楚.
来自《现代汉英综合大词