ask后面加什么介詞

　　You can ask for a chemical analysis of your tap water.

　　你可以要求給你的自來水做化學分析。

　　Is it too much to ask for a little quiet?

　　請略微安靜一點兒，這個要求過分嗎？

　　You're quite within your rights to ask for your money back.

　　你完全有權要回你的錢。

　　I'm going to ask for a rise.

　　我打算要求加薪。

　　Don't be too proud to ask for help.

　　不要放不下自尊而不求人幫忙。