about preposition

I don't want to focus on the person. It depends on the people. It was based on the truth. We talk about that. We are looking for someone. I graduate from university. I am good at teaching. They didn't care about her fake. I agree with her opinion. They have been suffered from the serious crime. They did it on purpose. Women are going on a diet. In korea, we usually memorize focus (on), depend (on), base (on), look (for), graduate (from), be good (at), care (about), agree (with), suffer (from), (on) purpose, (on) a diet, ect by idiom at the same time. By the way, can I regard as preposition?

Hello [이름], Wow, I hope I answered your question. See you tomorrow. Good night ^--^ I do not want to focus on the person. >> CorrectIt depends on the people. >> CorrectIt was based on the truth. >> CorrectWe talk about that. >> We talked about that. We are looking for someone. >> CorrectI graduate from university. >> I graduated from the University. I am good at teaching. >> CorrectThey didn't care about her fake. >> They did not care about her face.I agree with her opinion. >> CorrectThey have been suffered from the serious crime. >> They had suffered from the serious crime. They did it on purpose. >> CorrectWomen are going on a diet. >> CorrectIn Korea, we usually memorize focus (on), depend (on), base (on), look (for),graduate (from), be good (at), care (about), agree (with), suffer (from),(on) purpose, (on) a diet, >> The usage are correct ect by idiom at the same time. By the way, can I regard as preposition? >> What do you mean ect by idiom at the same time? >> Do you mean you use those phrases as an idiomatic expression? >> It is still a preposition however it is already a prepositional phrase, thereby producing an idiom that has a meaning that cannot be taken literally as it was when it was still a preposition alone used in the sentence.