__(be) my pencil and ruler on the desk?为什么是Are?There _(be) a pencil and ruler on the desk?为什么是is?二者有什么区别.

This __ (be not)my pencil case There __ a pencil and three pens in my boxa;is b;arec;will bed;is going to be __(be) my pencil and ruler on the desk?为什么是Are?There _(be) a pencil and ruler on the desk?为什么是is?二者有什么区别. Where _____ my pen and pencil? And where's my pencil-case? Where is my pen and pencil?还是Where are my pen and pencil? My pencil and my eraser（is）in my pencil bok.为什么要用is? There______a pen and some pencils in my pencil-box.A.is B.are C.be详细理由 How about my pencil case and my baseball什么意思 How about my pencil case and my baseball. Hwo about my pencil case and my baseball? where ()my pen and my pencil?1,are 2,is is,too,that,pencil,my,and) (is,case,yellow,this,a,pencil(is,too,that,pencil,my,and) (is,case,yellow,this,a,pencil)连词成句 What ________in my pencil-box?There is a pencil,a pen and an easer in it. This is my pencil ,and that is your.改病句 Where are my pen and pencil?'' ______in your desk.'' There ( ) (be) a book and some pencil.( )填啥 i have two pencils in my pencil case.(用there be句型改写)____ ____two pencils ____ my pencil case.