This is an orange
This is an orange
this is an orange.( )oeange is ( ) orange
An orange is orange
This is an orange(变成复数形式)
this an is orange jacket连句
This is an orange改为复数句
This is an orange.改为复数句.
This is an orange .[改为复数句]
is this an orange?(做出否定回答)
This is an orange orange.的同义句
This is a orange.It’s an orange.是否正确.
this is an orange.it is orange.为什么第一个加an,而第二个不加an