I assume this will come later in the course but such a verbal form/tense exists in Hindi indeed. I think the following would work (for a male speaker here): मैं खाता हूं (I eat) vs मैं खा रहा हूं (I am eating)

This sentence can mean both “I eat the banana” and “I eat a banana.” However, you can’t write “I eat banana” because that’s just not proper English :)

Hindi doesn't have an explicit definite article so you have to put one in there when translating as appropriate.