She is writing a letter., she isn't writing a letter, she aren't writing a letter, They are swimming in the pool., they is swimming in the pool, they are not swimming in the pool, I am cleaning my room., I am not cleaning my room., I am aren't cleaning my room., He is watching TV., He aren't watching the TV, He isn't watching the TV, We are playing basketball., We aren't playing basketball., We isn't playing basketball.

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