いつもお世話になっています。
中学３年生で受験があります。
Kiyoshi: Dad, do you use your cell phone every day?
Father: Yes, because I have to keep in touch with others for business.
Kiyoshi:Is it cnvenient?
Father: Oh, yes. But it is not ( used ) for talking only. We can also use it for e-mail and the Internet.
Kiyoshi: Then, what are the problems when people use their cell phones?
Father: Well, I think some people have bad manners when they use them. I don’t use a cell phone in a public place. Do you want to have one someday?
Kiyoshi: Yes.
の会話のなかの( )内のused なんですが、なぜ過去形になるのでしょうか。
英語が苦手です。よろしくお願いします・
