help的形容词词形式是？

Role-play is helpful in developing communication skills.

角色扮演有助于提高沟通技巧。

When you go to concerts, it's helpful to read the programme.

去音乐会的时候，看看节目单是有帮助的。

An A to Z of careers gives helpful information about courses.

一本按字母顺序排列的职业手册，提供了有助于课程选择的`信息。

Having the right equipment at hand will be enormously helpful.

有合适的工具在手边将会极为有用。