fit的過去式和過去分詞是什麼

雙語例句：

I go swimming every day in order to keep fit.

我每天游泳以保持健康。

If it doesn't fit, you can always take it back.

要是它不合適，你總還可以把它退回去嘛。

Fit people are better able to cope with stress.

健康的人較能應付壓力。

She still has a long way to go before she's fully fit.

她還需要很長時間才能完全恢復健康。

Well, I suppose I could fit you in at 3.45.

好吧，我想可以在3:45見你。