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old short
big thin
fat small
dirty
clean
否定式：
isn’t = is not
aren’t= are not
那么，
wasn’t= ________
weren’t = ________
was not
were not
then
now
He wasn't tall then.
He is tall now.
He was short .
then now
They weren't fat then.
They are fat now.
They were thin .
It wasn't new then.
It was old .
It is new now.
They weren't
clean then.
They are clean now.
They were dirty .
They are old .