I think it is an intersting book的否定句

I think it (is) intersting.哪个对? i think it is an an exciting thing的否定句 I think it's an old book怎么改否定句? 连词成句：intersting I is the game think To play football is intersting ,I think.(同义句） It is an English book(改为否定句） I think it's an exciting movies.(改为否定句) 初一英语句型转换!(1)I think it is an exciting game (该为否定句）I___ think I think Tom is an honest boy 改为否定句 改为否定句I think it is inyour sister is this is a very intersting book,i will buy it-- A.no matter h I think it is quiet street 改为否定句