英语翻译Ruler and pen are in the bag.为什么不用are?

英语翻译Ruler and pen are in the bag.为什么不用are? this is my pen.and that ruler is () too. HOW much the red pen and the blue ruler填空 Where --(be) my pen and ruler ----- -----under the desk the,what,and,color,ruler,the,are,pen连词成句 The pen and the ruler is blue.这句话错在哪里? 用color,are,the,ruler,pen,the,what,and连成一句话! this’s a pen and that’s a ruler.哪里错了 What _______ (be) on the desk just now?There ______ (be) a pen and a ruler. there two pencils,a pen,a rubber and a knife in it.And there is a long ruler 找错误 1.This‘s a blue ruler.2.Spell an “orange”,please.3.The pen and the ruler is blue. The book is near the ruler这句话对还是The book near the ruler这句话对?The pen between the pencil and eraser这句话对还是The pen is between the pencil and eraser对? I need a ruler ,a rubber ,a pen and some _____ paper （音标近似于right+ing) Spell an “orange”,please?哪里错了?the pen and the ruler is blue.哪里错了? A book,a pen,a ruler and an eraser___on the desk.请问是填is还是are?要用就进原则吗? This's a pen and that's a ruler.be 动词在什么情况下可以缩写什么时候不可以? I __ a pencil-box,a pen ,a ruler and two __ . I have a bike,___ ()a pen,a ruler and some pencils in guna's pencil-box.小括号应填什么?