frightened是惊恐的，有害怕的意思，而surprise只是惊讶surprise →普通用词，多指因未预料或意外的事而引起的惊奇之感。
The incident came as quite a surprise to them.
这一事件完全出乎他们的意料
You'll find that I don't frighten easily.
你会发现我不是轻易就会害怕的。
It frightened me sometimes to see that.
看到那种事， 有时真令我害怕。
She was frightened to ride a bike.
她不敢骑自行车。
frighten和surprise的区别
frighten释义：
vt. 使惊吓吓唬…
vi. 害怕，惊恐
surprise释义：
n. 惊奇，诧异突然袭击
vt. 使惊奇奇袭
adj. 令人惊讶的
