help的形容詞詞形式是？

Role-play is helpful in developing communication skills.

角色扮演有助於提高溝通技巧。

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

去音樂會的時候，看看節目單是有幫助的。

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

一本按字母順序排列的職業手冊，提供了有助於課程選擇的`資訊。

Having the right equipment at hand will be enormously helpful.

有合適的工具在手邊將會極爲有用。