She is scared of going out alone.
她不敢一个人外出。
If you ask me, she's too scared to do it.
依我看，她被吓得不敢做了。
The thieves got scared and ran away.
小偷害怕了，就跑了。
I was scared to death.
我吓得要死。
'Scared stiff' is an apt description of how I felt at that moment.
“吓得呆若木鸡”是对我当时感受的贴切描述。