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.