As a non-native speaker teacher of English, I have some questions for native speaker teachers.
In relation to relative clauses (RCs) with prepositions, as far as I know, two constructions are possible.
1-a I stopped by the house in which Beethoven was born.
1-b I stopped by the house which Beethoven was born in.
Both are viable options, right? However, in some cases, one of them
seems akward. For example,
2-a Is this the key for which you've been looking?
2-b Is this the key which you've been looking for?
3-a This book contains a theory on which his disertation is based.
3-b This book contains a theory which his disertation is based on.
In the above cases, b seems to be natural. However in the next case, a seems to be natural.
4-a This is the man to whom I gave money this morning.
4-b This is the man whom I gave money to this morning.
5-a The man with whom I am staying is a doctor.
5-b The man whom I am staying with is a doctor.
What do you think? Grammar books do not deal with this clearly, and I don't know how to explain it. Is this one of those "case by case" things?
Please help me out
