—No, it doesn't.
—Yes, he does.
⑴It was short then. A. They aren't young now.
⑵They weren't big then. B. It is dirty now.
⑶It isn't clean now. C. It wasn't tall then.
⑷They are old now. D. They were small then.
It (was/wasn't)young then.
It (is/isn't)old now.
They (were/weren't)dirty then.
They (are/aren't)clean now.
She (was/wasn't)fat then.
She (is/isn't)thin now.
Her hair (was/were)short then.
Her hair (is/are)long now.