Look This is a pen and it's red .The ruler is yellow.The key is white and the red jacket is BOb's

this is a my pen This is a nice pen. This is a pen.(this)are pencily Its my pencil case.Whats in it?Look,this is a pen. 下面哪个地方错了,如果错了,请改正Look!This is a pen. This a pen.that is a pen,什么 This is a pen.就划线提问 this is a pen.改为复数句 this is a pen改成一般疑问句 This is a pen.改为一般疑问句 is this a youe pen 怎样改错 This is a nice pen.的问句 This is a pen.(改为复数形式) this is a pen on English.改错 this is red a pen的提问 is this a pen?No it i(). This is a oeange pen对吗? is this a pen（变成陈述句）