"I am drinking tea."
Translation:Ich trinke Tee.
The last letter tell us about personal pronoun. It means if you said " trinke tee" without "ich" I will under stand you are talking about your self because of "e" which tell us about personal pronoun ، and so on.
More explain : In English: she, he, it take "s" in verb ، I, they, you, we without "s"..
In Deutsch most verb in present take: --- Ich - e . * er, es, sie ( she ),ihr - t . * du - st . wir, Sie ( they ) - en.
I hope I could explain it ☺.. May Allah bless you ☺..