kak buatkan dialog ketidak pastian

uncertainty expression
you : Hi, did you hear about our teacher?
your friend : What happened with our teacher? I heard nothing.
you : She got an accident in front of our school this morning.
your friend : Are you sure? (asking for certainty)
you : Yes, I'm really sure. I saw it when I got to our school. (responding certainty)
your friend : Did you really see her? (asking for uncertainty)
you : Hmm.. I didn't see her, but everyone talked that it was her. (responding uncertainty)
your friend : We should ask the headmaster about this.
you : I think it's a good idea.