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This is a pillow on the bed

That is two pillows on the bed

That are two pillows on the bed

This are a pillow on the bed

That is a computer on the table

That are two computers on the table

This is two computers on the table

This are a computer on the table

That is an elephant in the zoo

This is a lion in the zoo

That are two tigers in the zoo

This are four birds in the zoo