help的形容词性

　　I called the police but they weren't very helpful.

　　我叫了警察，但他们不太肯帮忙。

　　You'll find it helpful to talk things over with a friend.

　　把情况和朋友详细聊一聊，你会觉得大有帮助。

　　The people I spoke to were very helpful.

　　我交谈过的人都很肯帮忙。

　　It's natural to feel helpless against such abuse.

　　对这种虐待感到无能为力是自然的。

　　He lay helpless on the floor.

　　他无助地躺在地板上。

　　The audience was helpless with laughter.

　　观众情不自禁地大笑。