Ona inanman aptallıktır.
- It is stupid of you to believe in him.
Ona inanmakla aptallık ettin.
- It was stupid of you to believe in him.
I believe in you, man! You can do it!.
Do you believe in God? the Easter Bunny? ghosts?.
Do you believe in Jesus?.
... Well, I'm a physicist. We believe in testing theories to make sure that they are falsifiable ...
... Do you believe in that? ...