哪些短语动词在定语从句中不可将介词或副词与动词分离

1.含有介词的动词短语固定搭配一般不拆开使用，如：look for, look after, take care of等
(1) This is the watch which/that I am looking for. (T)
(2) This is the watch for which I am looking. (F)
2.若介词放在关系代词前，关系代词指人时用whom，不可用who或者that；指物时用which，不能用that；关系代词是所有格时用whose
(1) The man with whom you talked is my friend. (T)
(2) The man with that you talked is my friend. (F)
(3) The plane in which we flew to Canada is very comfortable. (T)
(4) The plane in that we flew to Canada is very comfortable. (F)(这里的talk with sb,fly in the plane,并不属于固定搭配,是直接就可以凑成的搭配,所以其介词可以提前)