[解題] THIS/THESE

[nodrug (whatever)]

WHAT IS THIS?
This is an apple.

What are these?
These are apples.

Is this your pen?
Yes,it is.

Are these your brushes?
Yes, they are.

以上有出錯的地方嗎?
沒有的話想請教一下,
我要怎麼說第３和第４的句型不能說

Yes, this is
Yes, these are

（是因為這樣會變成,是的,它是X.
                   是的,它們是Xs
卻沒有說出是什麼嗎?@@")

謝謝高手答覆.

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