bag的复数形式怎么写

　　例句：

　　Bags I sit in the front seat!

　　我一定要坐前面的位子！

　　He picked up his bags and hurried across the courtyard.

　　他拎起提包匆匆穿过院子。

　　The potatoes were sold loose, not in bags.

　　土豆是散装而不是袋装出售。

　　I had to lug my bags up to the fourth floor.

　　我只得费劲地把我的几个包拖上五楼。