I eat. Present Simple.
I ate. Past Simple.
I will eat. Future Simple.
I was eating. Past Cont.
I am eating. Present Cont.
I have eaten. Present Perfect.
I had been eating. Past Perfect Cont.
I have been eating. Present Perfect Cont.
I will have been eating. Future Perfect Cont.
I will be eating. Future Cont.
I will have eaten. Future Perfect.
I had eaten. Past Perfect.