英语中什么时候知道用的是非谓语?例如这句:But I was always busy,_____(able) to find any ​time

问题描述:

英语中什么时候知道用的是非谓语?例如这句:But I was always busy,_____(able) to find any ​time
for conversation with him.为什么是填unable而不是其他形式?

这题考的是形容词作状语,表示一个伴随的状态.
例如:
The girl failed in the exam and went home,unhappy.
We looked at the policeman,nervous and puzzled.