几个英语问题求具体分析

I don't know my way around.其中around做什么成分?

Everybody should try their/his best to learn English.不是说everybody后谓语动词用单数吗?try为啥不用tries?

Why od you choose the job?choose可用get替换吗?

在What do you do?一句中you可以I替换吗?

We hardly expected to find him still alive.中expect为啥用过去式?

Can you tell me what happens next?中happen为啥加个s,哪里看出是三单了?

I’m going to start when I finish high school.中when I finish high school为什么用一般现在时?