Indicate if subjonctive or infinitif
1) Je suis certain qu'il trouve le passeport
2) Est-ce que tu penses qu'il trouve le passeport?
3) On dit qu'il trouve le passeport
If you post your answers, I'll send this to one of our French experts.
Just for starters, subjunctive is a mood, and infinitive is not. I expect you mean indicative.
Just from my knowledge of Portuguese, I figure that 1 and 3 are indicative, and 2 is subjunctive.
But, as Ms Sue says, our French expert will be glad to give feedback on your thoughts.
1) subjontif
2) subjonctif
3) infinitive