Here is the man (who/that/whom)you''re been looking for.
Do you know any shops nearby in which I can buy flowers?
That is the headmaster with whom my father was talking just now.
Who is the man (whom) you talked with just now?
Mr Green,whom you know,is the tallest in our school.
The elephant is like a spear,as anybody can see.
（3）在the same ...as,such...as,as...as,the same...that中，as,that即使作宾语，也不能省略I have bought the same bicycle as you have (bought). (指同类用as)
This is the same book that I read the day before yesterday. (that指同一个)
This is the book (which) I read yesterday and which I find very interesting.
He is not the man (that) he used to be.
She is all (that) a teacher should be.
3.在there be 结构中出现定语从句，或在定语从句中出现there be 时，用作主语的关系代词也可省略。
There is a man downstairs (who) wants to see you.
This is the best dictionary (that) there is in the library.
The reason (why/that) he failed was his laziness.
That is the reason (why) I did it.
The way (in which/that) these comrades look at problems is wrong.
That was the way (in which/that) she worked the problem out.
例如：I don''t know the way that/ which leads to the top of the mountains.
The second time (that) I saw him was in 1980.
I don''t know the exact time (when/that) the sports meet will take place.