This is a key. (改为复数句) They are a set of_.
This is a key. (改为复数句) They are a set of_.
This is a key.(改为复数形式)
a key is on the table改为复数句
This is his ruler(改为复数句) That is my key(改为复数句) These are his
Is this a bus (改为复数句
this is a pencil改为复数句
This is a shirt .改为复数句
this is a pen.改为复数句
this is a letter改为复数句
this is a tree 改为复数句
This is a pear.改为复数句
This is a dog :改为复数句