Our teacher is good. нужно написать это предложение в повествовательной форме, отрицательной и вопросительной четырёх временах: present simple, present con tinuous,past simple & future simple.

Present Simple.
+ Our teacher is good.
- Our teacher isn't good.
? Is our teacher good?

Past Simple.
+ Our teacher was good.
- Our teacher wasn't good.
? Was our teacher good?

Future Simple.
+ Our teacher will be good.
- Our teacher won't be good.
? Will be our teacher good?

Про континиес можно замутить:
+ Our teacher is teaching us good.
- Our teacher isn't teaching us good.
? Is our teacher teaching us good?