Mary walks in the forest in spring, too
Martin visits friends in winter, too
Thomas plays tennis in summer, too
Tiny rides my/her bike in autumn, too

1. We walk in the forest in spring - Mary walks in the forest in spring.
2. They visit friends in winter - Martin visits friends in winter.
3. You play tennis in summer - Thomas plays tennis in summer.
4. I ride my bike in autumn - Tiny rides her bike in autumn.

Как-то так. Спасибо за вопрос.