Эти предложения сделани в present continuous: they are playing chess now i am the happy at the moment надо превратить в present indefinit, и present perfect
1. Present indefinit: They play chess. I am happy. 2. Present Perfect: They have played chess. I have been happy at that moment. Но я точно не уверена.
They play chess. I am happy.
2. Present Perfect:
They have played chess. I have been happy at that moment.
Но я точно не уверена.
I have happy already