sit的过去式和过去分词？

双语例句：

I don't get much exercise sitting in the office all day.

我整天坐在办公室很少运动。

There were several young people sitting around looking bored.

有几个年青人闲坐着，一副无聊的'样子。

Don't just sit watching television ─ make yourself useful!

别光坐着看电视——帮一下忙吧！

I don't pay you to sit around all day doing nothing!

我不是花钱雇你整天闲坐着的！

He sat taking notes of everything that was said.

他坐在那儿记下了所说的每一件事。