1.can't help to do sth 情不自禁做某事

例如：i can't help to hug her 我情不自禁地抱紧她= =b

2.it helps to do sth 对于做某事来说很有帮助

例如：the winds helps to sail on the sea风对于海上航行来说很有帮助

3.help oneself to do sth 叫做随意做些。。

例如：please help yourself to eat something 请随便吃点什么东西

4.还有最简单的help sb to do sth 帮助某人做某事

我只想到这些了，希望对你有帮助