Yesterday, our monitor sent a message for us about change the new dorm next term.
Yesterday, our class monitor sent us [1] a message about changing [2] to the new dorm next term.
Note: 1) indirect object goes before direct object, as in I gave her the book. But I gave the book to her is also acceptable, but probably less common.
2.1) change should be a changing, a gerund,since it follows the preposition about.
2.2) you change rooms and change clothes and change your mind, and I guess you can change dorms, but then you would have to drop the new and say: ...sent us a message about changing dorms next term.
2.3) it might be better to say
Yesterday, our class monitor sent us a message about switching to the new dorm next term.
 
I hope old roomates will live together agian,but it's impossible. because we are in differnt class.
I hope my old roomates and I [1] will live together agian again, but it's impossible. because we are in differnt classes.
3.1 Unless you are making a general statement about hoping that all old rommates will be together in the new term, you might want to show that you are talking about your old roomates and also include yourself in the group, too.

It's a problem raising, my friend Yuki call me and invit me to join them first, and then my old roomates who in my class, she want to live with me. but I don't like.
It's a problem raising. It raises a problem.
First, my friend Yuki called me and invited me to join them [her and her class mates], and then one of my old roomates who is in my class, she wanted to live with me. But I don't like that idea.
> First, my friend Yuki called me and invited me to join them, and then one of my old roomates who is in my class said she wanted to live with me.

I'm evry appreciate that she thinks about the interests of me. I'm sorry to her and I accepted Yuki's invitation.
I'm evry  really appreciate the fact that she thinks about the my interests of me.

I'm sorry to her and I accepted Yuki's invitation.
> (probably what you means to say is)  I told her I'm sorry and that I had accepted Yuki's invitation.  OR (but probably less likely)
I told her I'm sorry and then I accepted Yuki's invitation.