Past Tense:
* Harvested: The farmers harvested a bountiful crop of wheat this year.
* Had harvested: They had harvested all the apples before the first frost.
Present Tense:
* Harvest: We harvest the grapes in the fall.
* Are harvesting: The workers are harvesting the coffee beans right now.
* Harvesting: Harvesting the crops is a lot of work.
Future Tense:
* Will harvest: The farmers will harvest the corn next week.
* Are going to harvest: We are going to harvest the pumpkins in October.
* Will be harvesting: They will be harvesting the rice by next month.