1. We fear him.我们害怕他。
2. We fear for him.我们为他担心。
fear for sb./sth.为某人（某事）担忧、关心、焦急
All his employees fear him.
Many people fear change because they do not like the old ways to be disrupted.
We fear for his safety.
He feared for his mother, left alone on the farm.
Carla fears for her son.
He fled on Friday, saying he feared for his life.
1.fear to do sth.害怕做某事;不愿意做某事
She feared to tell him the truth.
Old people fear to leave their homes.
She pursed her lips together, as though fearing to betray her news
2.……fear that 从句，恐怕……，担心……，的可能性，
She had feared she was going down with pneumonia or bronchitis
There was no fear that anything would be misunderstood
I fear that a land war now looks very probable
There is a fear that the freeze on bank accounts could prove a lasting deterrent to investors.
We would overcome any weakness, any despair, any fear.