Could you cover for me on Tuesday?
你星期二能幫我代班嗎？

cover 覆蓋；遮住
cover sth with sth
用...遮住...
cover his face with hands.
用手遮住臉
cover for sb
代替某人工作（因為某人生病或離開）；包庇某人
I covered for him when he was ill.
他生病的時候是我替他的班。
Why would she cover for someone who was trying to kill her?
她為什么要包庇那個試圖殺死她的人呢？

A:Could you cover for me on Tuesday? I'm not coming back until Wednesday.
你星期二能幫我代班嗎？我要到星期三才回來。
B:Sure.What's up?
當然可以。有什么事情嗎？
A:We're going to the beach for the weekend.
我們周末要到海邊去玩。
B:Are you going fishing?
你要去釣魚嗎？
A:No.Just some fun in the sun. We really need to get away and relax for a few days.
不，只是去曬曬太陽。我們真的需要去放松幾天了。
B:Well,don't worry .I'll take care of the business for you. Have fun.
不要擔心，我會替你做好工作的。你好好的玩吧。