现在进行式 (am/is/are + V-ing)

说话时或目前一段时间内正在发生的动作(此动作尚未完成)

The water is boiling. Can you turn it off? 水开了，把它关掉好吗？

Are you cooking? 你在煮东西吗？

What are you cooking? 你在煮什么？

Something is burning! 有东西烧焦了。

What are you talking about? 你们在谈什么？

You are talking about me, aren't you? 你们在谈论我，对不对？

Hurry up! Everybody is waiting for us. 快一点，大家都在等我们。

I'm learning driving. My father is teaching me.

我在学开车，我爸爸在教我。

It's raining. 下雨了。

It's raining cats and dogs/hard/heavily! 雨下得好大哟！

It is drizzling. 正在下毛毛雨。