这个后面是定语从句么?He recorded everything that happened on his trave

The man with whom she was traveling is her boyfriend.
＝The man (whom/who/that) she was traveling with is her boyfriend.
当介词后置放在了动词后面,介词不放在that前面时用whom,who ,which,that 都可以.
但是,紧跟在介词后面指人时用:介词＋whom(不能用who),紧跟在介词后面指物时用:介词＋which(不能用that).而且当介词后置同时whom/who/that/which做宾语时,which/whom/that/who还可以省略.
We want to call on the famous scientist (whom/that/who) we have often heard about.

1 你说得没错；
2 不能，如果要放在traveling 后面的话就要做修改．
The man "who" she was traveling with is her boyfriend.
即就是把whom改成who

第一句：你理解的不错
第二句：可以那么写，不过得把宾格的whom改成who，写成“the man who she was travelling with is her boy friend”

1:该句是定语从句，that是代替everything作后面的主语。
翻译为：他把旅途中发生的一切都记录了下来。
2：第二个，with能放后面。这个无所谓的。只要whom用对了就行。