学员HQ9EDU09060: 老师，请问When，while，as，前后应该加的时态是什么？

老师回复: (continued)

as 常用于:

1 表书两个发展变化中的情况:

As you grow older, you'll know better and better about yourself.

2 表示"一边……一边……“：

They talked happily as they walked along the river.

3 表示随着短暂动作的发生，另一行为伴随发生：

My cap was blown away as I sat down.