What? 没听懂时说what有些不礼貌,用sorry? 比较好
I didn't catch you. 我没听懂你说什么。
Could you speak up a little? 你能大一点儿声吗?
I'm terribly sorry. 我真的超级对不起你。
give up the seat 让座
I'll go first. 我先走了的错误用法,chinglish
I'll be on my way.=I'm off.= I'm leaving. 我要走了
I'm on my way. 我已经在路上了