这是网上的区别
be aware of意思就与know相近了.
realize是强调对一件事的认识性意识到了.
perceive 1.v.become conscious/aware of
She finally perceived the futility of her protest
2.v.to become aware of through the senses.意识到;理解
I perceived a man enter the house.我看到一个人走进这间房子.
I can't perceive any difference between these coins.我看不出这些有什么差别.
He gradually perceived that his parents had been right.=realize