1.the pen is （orange）.
否：the pen isn't orange.
一：ls the pen orange?
划：what colour is the pen?
2.lt is a （green chair）
否：lt isn’t a green chair.
一：ls lt a green chair?
划：what's it?.
3.that is （my father）.
否：that isn't （my father）
一：is that your father?.
划：who‘s that?
4.this is （a pencil）.
否：this isn’t a pencil.
一：is that a pencil?
划：what's this?