它是由X制作的.是写成 It is produced by is 用变成was吗?

它是由X制作的.是写成 It is produced by is 用变成was吗? It is my dream to do sth的过去式怎么说?要把is变成was吗? thunder is produced by the rapid expansion and c The film produced by Cindy Clark is a horror film.对“produced it is not produced 和it does not produced有什么区别 强调句it is（was) .that/who,其中it is（was)能不能写成it's/it was不能缩写么? Is it in this factory__"Audi" cars are produced?( ) Is it in that factory "Red Flag" cars are produced? it is ...since it was...before 一定是过去式吗? 英语 昨天买了一个礼物 今天有人问它是什么 用what is it?还是what was it? It is a good movie that was recognized by people通顺吗 它是你的吗?到老师那里去找 Is is yours?___ the teacher___ it.