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a book
a dictionary
This is a ruler.
-- Is this a ruler?
-- Yes, it is.
These are rulers.
-- Are these rulers?
-- Yes, they are.
That is not my schoolbag.
-- Is that your schoolbag?
-- No, it isn’t.
-- No, they aren’t.
Those are not my schoolbags.
-- Are those your schoolbags?
拍拍手，练练口
Is this your pencil? Is this your pencil?
Yes, yes, it is. Yes, yes, it is.
Is that your book? Is that your book?
No, no, it isn’t. No, no, it isn’t.
Are these his bags? Are these his bags?
Yes, yes, they are. Yes, yes, they are.
Are those her pens? Are those her pens?
No, no, they aren't. No, no, they aren't.
Grammar Focus
this, that , these, those
表复数
this
these
that
those