是不是There is a pen and a pencil但是是These are a pen and a pencil?有很多时候分不清是用is还是are,什么时候用哪一个大家能不能告诉我一下

There is ( ) “P,( )“E”and ( )N in pen.(a/an) there is a pen in my pencil-box.there is an apple on the table. What ________in my pencil-box?There is a pencil,a pen and an easer in it. there is a pen 对a 提问 There is ( ) “P,( )“E”and ( )N in pen.(a/an)好吧看似简单却让人费解有人说是填a,an, 可以说There is a pen here吗 There is a pen.的问句 There is a pen and an eraser in the box否定句和一般疑问句和a pen and an eraser 划线提问 There is ___ u,___ s and ___ e in use.(a/an)出错题了! 应该是这道题 There is ( ) “P,( )“E”and ( )N in pen.(a/an) There is a pen and a pencil 还是There are a pen and a pencil I_______buy a new pen because there there is no pen in my pencilcase. This is a pen,and ____is a pencil over there there _ a pen and abook A.is B.are this is ------- -------- （pen).There are -------- (pen).填空 there is a pen in the pencilbox对a pen 划线提问对句中的a pen 划线提问啊 a pen is there in bag the 连词成句 there is a pen on the desk 变为复数 There is a pen in my bag.【改为一般疑问句】