改成复数句.
Whatisit?It'sabox.
改成单数句.
ThechildrenareYOUNGPioneers.
改成复数句,并作肯定回答.
Isthisaredpen?
改成复数句,并作否定回答
IsthatanEnglishbook?
改为单数句
Thoseareapples
Thosearen'tanyoranges