Here are the main grammatical features of the verb “to eat”:
Present tense:
I eat
You eat
He/She/It eats (note that -s is added to eats).
We eat
You eat
They eat
Past tense:
I/You/He/She/It/We/They ate
The form ate is the same for everyone, no matter who eats.
Past participle:
Eaten is used together with the verb “have”. For example, “I have eaten.”
Questions and negations:
Present tense: For questions, we use do/does. For example, “Do you eat breakfast?”. For negations, we use don't/doesn't. For example, “I don't eat meat”.
Past tense: For questions, we use did. For example, “Did you eat lunch?”. For negations, we use didn't. For example, “I didn't eat lunch.”
Future tense:
Will eat is used for the future tense. For example, “I will eat dinner later”.
Progressive forms:
Am/Is/Are eating is used to describe actions that are happening right now. For example, “I am eating right now”.
Comparative and superlative degree:
The verb “eat” has no comparative or superlative degrees because it is an action, not an adjective.