有没有be helpful to sb

有没有be helpful to sb 有没有be helpful（for sb） to do这个短语 对某人有用是be helpful to sb.还是be helpful for sb? be helpful to sb 对某人有帮助的 be friendly to sb to后接人称代词时,是不是都要接宾格呀? sb be made to do sth有没有这个句式? think sb to be有没有这种用法? think sb to do/be有没有这种用法, 有没有think of sb to be 这种说法 有没有know sb/sth (to be)/as这个词组? 有没有do good to sb,那么be good to sb 呢 ,例句 be helpful to还是for好像是be helpful to那有be help 怎么好多人说是be helpful to 还有 把问题回答全 ok？ 作文Be helpful to others Be helpful to others急! tell to Sb有没有 be helpful to others的另外一种说法和help sb.to do sth.的另外一种说法 be helpful in be helpful to be helpful for 三者区别即怎么用 关于be seen doing 和 be seen to do有 see sb doing 和 see sb to do,那么相应的,被动要还原to,是不是就改成sb be seen to doing 和 sb be seen to do?但好像没有sb be seen to doing 这种说法,只有sb be seen doing. 有没有sb be considered doing 用法?