I think I'm going to be sick.

我想我快吐了。

The child started to be sick after eating too much candy.

孩子吃了太多糖果後開始嘔吐。

I'm feeling a bit sick today.

我今天感覺有點不舒服。

She's been sick with the flu for a week.

她患流感已經病了一周。