Can you say Mit keresel? Also, is keresel definite or indefinite?
Yes, it's a correct sentence, and 'keresel' is indefinite. The definite form is 'keresed'.
Is there a workbook you can recommend where it will break down the tenses and the plurals?
What is the difference between keresel and keresek other then ones plural?
What do you mean with "plural"?
Neither is plural.
What is the difference between Miket keresel and miket keresed?
Two questions: why "keresel" and not "keres," or "kerest," and why is "miket" translated as what but not which, if it is plural?
I remember the previous exercise use the sentence 'Mik keresel?' Is this also correct?