1. Past Tenses:

Past Simple: I ate an apple

Past Continuous: I was eating an apple

Past Perfect: I had eaten an apple

Past Perfect Continuous: I had been eating an apple

2. Present Tenses:

Present Simple: I eat an apple

Present Continuous: I am eating an apple

Present Perfect: I have eaten an apple

Present Perfect Continuous: I have been eating an apple

3. Future Tenses:

Future Simple: I will eat an apple

Future Continuous: I will be eating an apple

Future Perfect: I will have eaten an apple

Future Perfect Continuous: I will have been eating an apple