I'm Canadian. → (-) .........
I'm NOT Canadian.
Selma's boyfriend isn't very cute. → (+) .........
Selma's boyfriend IS very cute.
The weather is rainy today. → (-) .........
The weather ISN'T rainy today.
I'm not Mary's sister. → (+) .........
I'M Mary's sister.
Our family isn't big. → (+) .........
Our family IS big.
Your books are in your backpack. → (-) .........
Your books AREN'T in your backpack.