Dear teachers,
Please read:
1.Monday is the day [color=red]on which we will come.
2.The building [color=red]where he lives is very old.
3.The building [color=red]in which he lives is very old.
4.The building [color=red]which he lives [color=red]in is very old.
5.The building [color=red]that he lives [color=red]in is very old.
6.The building he lives [color=red]in is very old.
I think all are correct in grammar. Please share with me your opinion? (what sentences are correct, incorrect, more common…?)
Thanks
Quoc