It is not exactly like the previous thread because I did not mention "for which, with which, and to which". I did not want to post a reply for " for which ,with which, and to which" which did not mention in the title of the previous thread.Until now, I can not use whom and who correctly. As for your question, no one asks me to study them. I just want to write a longer sentence with different structures.The way I write sentences are simple. The difficulty arises because of the differences between English and my native language Arabic. If you want to close that thread and post in the previous thread , no problem. Thank you.