Present, to show an action which is happening at the time of speaking., future plans or arrangements , something which we think is temporary, something which is new and contrasts with a previous state, something which is changing, growing or developing, something which happens again and again in present , Past, to show an action which was happening in the past, to show an action which was happening when another action, one action interrupts a second action in the past, something which happens again and again in past, Future , an action will be happening at a time in the future, will be in progress at a specific time in the future.

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