I have already asked ( ) to back-up for me.
倘若使用于同事之间，如果感情比较好就直接放入名字，如果比较正式可以使用 Mr./Ms.
例如： I have already asked Mr. Smith to be my back-up.
I have already asked John to be my back-up.
或者礼貌一点的可以：
I have requested Mr. Smith to be my back-up
或是 I have asked John to be my back-up.
希望能够帮到你。 :)
i have already asked for sb to be my back up!
I have asked XXXX to be my back up .
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