was been doing是什么时态

例句：

1、I was wondering if you were doing anything this weekend.

我想知道这个周末你是否要做什么。

2、While they were doing their homework, I was doing the laundry.

他们在做家庭作业的.时候，我正在洗衣服。

3、It was the locals who felt like what they were doing was dangerous.

当地人觉得，他们这么做是很危险的。

4、He was doing this for himself, not for his father.

他这么做是为了自己，不是为父亲。

5、He knew exactly what he was doing.

他清楚地知道自己在做什么。