Вставьте времена: james (be) so keen on games that he (try) to play before he (be) fit enough unless someone (keep) an eye on him. можно использовать следующие времена: present simple / present perfect / future simple / past simple / present continuous

Вот, изменила в следующий раз не забывайте о контексте!

James is so keen on games that he will try to play before he is fit enough unless someone keeps an eye on him.