You sigh a deep sigh.  你深深地叹了口气；

It seems like you are dreaming a terrible dream. 看来你仿佛是在做噩梦一般。

有些不及物动词可变成及物动词，此时其后以其同系名词做宾语。所谓同系名词乃指词源和意义与动词相同的名词，其形态与动词一样，但用法有改变。

die ---> death (死）；

dream---> dream (梦）；

laugh----->laugh(笑）；

live----> life (生活）；

sigh----->sigh(叹气）；

sleep----> sleep(睡眠）；

smile---> smile(微笑）。

** dream做不及物动词需与of连用。

eg. The victims of the plane crashdied a terrible death.

I dreamed of my deceased grandfather last night.

After going out with my grilfriend, I always dream a sweet dream of her at night.

The fat man laughted a hearty laugh when his friend called him Mr. slim.

I live in Hong Kong but work in Kowloon.

Though I am not rich,I live a comfortable and happy life.

After the picnic, the child slept a really sound sleep.

Jane lives a happy life.

The old man smiled a sad smile.