help的形容詞是什么怎么寫

　　The receptionist was less than helpful.

　　那接待員一點忙都不幫。

　　The following information may be helpful to readers.

　　下列信息可能對讀者有用。

　　The catalog includes helpful information on the different bike models available

　　目錄中包括了在售的各種型號自行車的有用信息。

　　It's natural to feel helpless against such abuse.

　　對這種虐待感到無能為力是自然的。

　　He lay helpless on the floor.

　　他無助地躺在地板上。

　　The audience was helpless with laughter.

　　觀眾情不自禁地大笑。