- - you do then?I- to Hainan with my parents.

- - you do then?I- to Hainan with my parents.
- - you do then?I- to Hainan with my parents.

- - you do then?I- to Hainan with my parents.
What did you do then?-然后你又做了什么呢?
I went to Hainan with my parents.-我和我的父母一起去了台湾

what did you do then ?
went 表示过去时态
这个句子比较合适用过去时
what do you do then ?
go 表示一般时态
what will you do then ?
将来时时是 will go
你看你的句子处于什么时态就填啥啊
呵呵