Ответ:
- Mary and Tom run very fast.
- Sasha doesn't swim well.
- They don't play football.
- My mom enjoys going to the zoo.
- The baby doesn't cry a lot at night.
Обрати внимание на использование doesn't для he/she/it.
Редфлаг: Не путай do/does в утверждениях и отрицаниях.