pliss tolong dijawab ya

1. (+) The teacher infroms about the speaking contest.
    (-) The teacher doesn't infroms about the speaking contest
    (?) Does the teacher infroms about the speaking contest?
2 (+) The farmer cultivates his rice field
    (-) The farmer doesn't cultivates his rice field
    (?) Does the farmer cultivates his rice field?
3 (+) The students have an experiment in the field 
   (-) The students don't have an experiment in the field
   (?) Do the student have an experiment in the field?

Maaf kalau salah