because不是动词，没有动词过去式

Just because I never complain， people think I'm satisfied.

就因为我从不发牢骚，大家便以为我满意了。

2

Prices soar because of the civil war.

由于内战， 物价飞涨。

3

I love you because I like who I am when I am with you.

我爱你因为我喜欢与你在一起时的那个我。