Verified answer

I have been speaking about the exam with my teacher for an hour and she thinks (that) I've passed it.

oppure:

I have been talking about the exam to my teacher for an hour and she thinks (that) I've passed it.

Se usi la seconda, cioè quella col verbo talk la preposizione deve essere "to"...non scambiarla con with o sarebbe sbagliato!

I've been talking for an hour with my teacher and she thinks that I have passed the exam.

I have been talking about it with my teacher for an hour and she think I've passed my exam.

in che lingua scusa?

ma in che lingua

I have been talking with my teacher about it since an hour and she thinks i passed the exam.

is a hour that i speak with my teacher and she thinks that has passed.

E' molto semplice: I have been talking with my teacher about it since an hour and she thinks i passed the exam.

Ciao Ciao!