kak tolong dibantu yaa besok udah dikumpulkan, pliss

(+) The teacher is informing about the speaking contest
(-) The teacher is not informing about the speaking contest
(?) Is the teacher informing about the speaking contest?

(+) The farmer is cultivating his rice field
(-) The farmer is not cultivating his rice field
(?) Is the farmer cultivating his rice field?

(+) The students are having an experiment in the field
(-) The students are not having an experiment in the field
(?) Are the students having an experiment in the field?