问题 what I thought I would do，I thought I might...... what的分析

 what是I thought的宾语从句的连接代词，即I thought what I would do.因整句为从句所以将what提前   是这样吗？        

话题 You're up

话题 Are you all right?

话题 if you ask me

话题 put you on notice

话题 He you more help

话题 near where you live

话题 if I were you

话题 you're finished

话题 you've finished

话题 Get lost will you

话题 But you have promised

问题 on a checkout line搭配不太规范吧

HOW WILL you know if the person next to you on a bus, aeroplane or checkout line is infectious with covid-19? checkout line前用at才符合习惯吧。谢谢各位大咖专家老师！

问题 分析用示：Won’t you have a seat?

Won’t you have a seat? 此处为何使用won’t? 用will 可以么?will you 表示邀请、请求，那上面这句话为何用won’t呢 ？直接用will 可以么？意思一样么 ？这句是我在朗文词典找到的，不理解。

问题 求解at the open day（为何不用on the open day）

...end of his speech,there will be 30 minutes for questions and answers.So,if you are interested in knowing more about China, you mustn’t miss the chance to meet David at the open day.我对最后一句中的 at the open day 不理解，为什么用介词 at 呢？在某一天不是该用介词 on ...