frighten(ed)

1.Helen is frightened of Jack和He is frightened of the forest以及She is frightened of being left behind等句子里用of。

在指一时的惊恐的时候在frightened后面往往用at。例如：The boy dare not enter the gate because he was frightened at the dog.

2.关于a frightened cry（受惊的喊声）等，参见much 3 (5) E