对某人有用是be helpful to sb.还是be helpful for sb?
对某人有用是be helpful to sb.还是be helpful for sb?
be useful for sb.对…有好处; be useful to sb.对某人有用;
be helpful to sb 对某人有帮助的 be friendly to sb to后接人称代词时,是不是都要接宾
有没有be helpful(for sb) to do这个短语
是be free to sb 还是be free for sb
是be sorry for sb 还是be sorry to sb
是be difficult to sb 还是be difficult for sb?
对什么有帮助 是be help for 还是be helpful for
be rude to sb还是for sb
be important to sb还是for sb
be embarrassing to sb还是for sb?
be helpful in be helpful to be helpful for 三者区别即怎么用