helpful for sth? 还是to sth

it's hlepful to your health为正确表达。

首先纠正一下楼亲你单词拼错了,是helpful而不是hlepful,呵呵!

应该是be helpful to sb,表示对某人有帮助.

it's +adj+ for sb to do sth
所以it's hlepful for your to keep health

后面是sb.还是sth.都一样

be helpful to sb/sth 对某人/某物（如健康）有益