frighten的用法很多。
一、frighten vt./vi.，常作vt. ，意为"使惊吓、使惊恐"。
1、 frighten sb. 意为"恐吓某人"。
Dont frighten her. Shes just a little girl.
别吓唬她。她只是个小女孩。
The dog tried to frighten us， but it failed.
这条狗想吓唬我们，但是失败了。
2、 be frightened of... 意为"害怕"。
The little girl is not frightened of dogs. 这个小女孩不怕狗。
3、 be frightened by... 意为"被吓坏(吓一跳)"。
She was frightened by the shadow of the tree.
她被树影吓坏了。
4、 be frightened at... 意为"看到......感到惊恐".
She was frightened at the sight that he was drowned.
她看到他被淹死的情景感到恐惧。
5、 be frightened + to do sth.意为"害怕做某事".
She was very frightened to look down from the top floor of the building.
她很害怕从那栋建筑物的顶楼往下看。
6、 frighten sb. to death意为"把某人吓坏"，被动式为be frightened to death. When he saw the bear in the forest he was frightened to death.
当他在森林里看见熊时，他被吓坏了.
7、 frighten sb. / sth. off / away意为"将某人/某物吓跑"。
The childrens shouts frightened the birds off.
孩子们的喊声把鸟儿吓飞了。
二、frightening， frightened是frighten的分词形式。
frightening意为"令人惊恐的、恐怖的"，常用来说明事物的特征。
frightened意为"恐惧的、害怕的、受惊的"，常用来说明人的特征。
两者都可用作表语或定语。
The film is very frightening.
这部影片非常恐怖。
The frightened children were calling for their mothers.
受惊的孩子们呼喊着找妈妈。
