employer可數(shù)嗎

　　To employ native English teachers to teach in China.

　　聘請(qǐng)母語為英語的教師來中國(guó)任教。

　　I'll engage in John's behavior if you decide to employ him.

　　如果你決定聘用約翰，我愿為他的行為擔(dān)保。

　　I'll engage for John's behaviour should you decide to employ him.

　　如果你決定聘用約翰，我愿為他的行為擔(dān)保。