这些短语的区别不很容易捉摸，一般来说：
get to know 了解，更靠近... 以便了解
know 认识，知道，对...有知识
know of 用听过（但不曾有交往），对...有表面上/肤浅的意识
know about 对...有一点知识（通过交往或别人告知）
例句：
Mary has known John for a year, but she wants to get to know him better.
I know this person. He works in my office. His name is John.
I know the book. I have read it.
I know of a place that sells this particular phone, but I have never shopped there.
I know something about this phone. It's made in China. It has an excellent camera. Its battery lasts a long time. And, it is inexpensive.
我是加拿大人，前英语老师
满意请及时采纳，谢
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