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A visualization of what we mean in English by the various tenses:

A visualization of what we mean in English by the various tenses

For the sake of presenting the information in another way:

I eat

habitually; in general.

“I eat venison occasionally.”

as a command

“Now, we eat!”

I am eating

at this point; at this point, continuously; at a point in the future.

“I am eating these leftovers. Would you like some?”
“I am eating lunch with John on Thursday.”

I ate

at a point in the past.

“I ate squid once.”
“I ate lunch early today.”

I was eating

at a point in the past, continuously.

“I was eating my dinner, when the phone rang.”

I have eaten

at a point in the past; in the past in general.

“I have eaten many different kinds of sushi.”

I have been eating

up to and including now, continuously. = I was and am eating.

“I have been eating the bread that's on the counter, not knowing it's mouldy.”

I had eaten

before a point in the past.

“I had eaten barbecue before, but this steak was better than any I'd ever tasted.”

I had been eating

up to and including a point in the past, continuously.

“I had been eating breakfast in bed, till I started seeing ants in my room.”
“I had already been eating for fifteen minutes by the time she showed up.”

I will eat

at a point in the future; in the future in general.

“I will eat an apple a day from now on.”
“I will eat dinner with you tomorrow if you want.”

I will be eating

up to and including a point in the future, continuously.

“I will be eating only a little bit of this cake. You can have the rest.”

I will have eaten

before a point in the future.

“I will have eaten by the time you get out of work, so we can't eat together.”

I will have been eating