Поставьте предложения в вопросительную и отрицательную форму: 1. lands are very important resources for man. 2. those farmers used the river bottom land for growing tomatoes and cabbage. 3. we have unlimited land resources on our planet.

1. Lands aren't very important resources for man.
   Are lands very important resources for man?
2. Those farmers didn't use the river bottom land for growing tomatoes and cabbage.
    Did those farmers use the river bottom land for growing tomatoes and cabbage?
3. We don't have unlimited land resources on our planet.
   Do we have unlimited land resources on our planet?