Have you studied conjugations and declinations? I guess most of your questions will be answered there. essen = infinitive = "to eat" ich esse = 1st person singular = "I eat" er isst = 3rd person singular = "he eats" (note the "s", English also conjugates verbs) trint = doesn't exist trinken = infinitive = "to drink" ich trinke = 1st person singular = "I drink" er trinkt = 3rd person singular = "he drinks" einer/eine/ein = various forms of the article "a" du, dir, dich = various forms of the informal personal pronoun "you" Sie, Ihr, Euch = various forms of the polite personal pronoun "you" (same form as 3rd person plural, but capitalized) friend = der Freund (always learn nouns together with the article, so you can remember the gender)

ich esse - I eat/ I am eating du isst or er/sie isst - you eat/you are eating or he/she eats/he/she is eating er/sie trinkt - he/she drinks/is drinking sie trinken - they drink/are drinking eine/ein - a (eine: feminin, ein: maskulin or neutral) Ihr - your (polite) or ihr - you plural du - informal you singular Sie - formal you In German, due to the conjugation verbs have to be changed for every person. Freund - male friend Freundin - female friend