sb cannot help doing sth.忍不住、情不自禁做某事.
eg.i cannot help thinking of you.我忍不住总是想你.
sb help sb do sth.某人帮助某人做某事.
eg.she helped regain my faith.她帮我重拾信心.
sth help do sth.某事促进/有利于某事的发展.
eg.cooperation will definitely help improve bilateral relationships.合作必将有利于促进双边关系.
sb is helping.某人很乐于助人.
eg.he is a really helping guy.他特别乐于助人
sb is helpful.某人能帮的上忙.
eg he is always helpful.他总能帮的上忙.