6)
1.couldn't play,could
2.could run,couldn't
3.couldn't cook,could
4.could sit,couldn't
5.couldn't eat,could
7)
1.He couldn't play football.He can play now
2.He could run fast.He could now
3.He couldn't swim.He could swim now.
4.He couldn't read.He can read now.
5.He couldn't speak English.He can speak now.