She is scared of going out alone.

　　她不敢一個人外出。

　　If you ask me, she's too scared to do it.

　　依我看，她被嚇得不敢做了。

　　The thieves got scared and ran away.

　　小偷害怕了，就跑了。

　　I was scared to death.

　　我嚇得要死。

　　'Scared stiff' is an apt description of how I felt at that moment.

　　“嚇得呆若木雞”是對我當時感受的貼切描述。