What about "I am eating a lemon" ?
"Ben bir limon yiyorum," I think.
Yiyorum= simdiki zaman. Yerim= genis zaman yerim olacak
What about past tense? Like I want to say I ate a lemon. For that what should I change?
For the past tense, you can use this structure:
Ye- is the root means "To eat"
Ye(di)m -> I ate
Ye(di)n -> You ate
Ye(di) -> He/She/It ate
Ye(di)k -> We ate
Ye(di)niz -> You (plural) ate
Ye(di)ler -> They ate