Unit 4 Is this your pen？ 习题（无答案）

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Unit
4
Is
this
your
pen
习题
一、按要求转换下列各句
1.
Is
this
your
pencil
(作肯定回答)
Yes,
___________
2.
Is
this
your
ruler
(否定回答)　
___________,
it
________
3.
Is
this
his
dictionary
(改为肯定句)
_______________
his
dictionary.
4.
It
is
an
English
book.
(改为否定句)　
_____________
an
En...