Would you like to try it on? 你想试试吗？

　　May I try on a pair of shoes? 我能试试这双鞋吗？

　　Is it okay to try on anything I want? 我可以想试哪件就试哪件吗？

　　May I try on a pair of shoes? 我可以试试这双鞋吗？

　　Sure. What size do you need? 好的，您穿多大码？