kalimat present,past,future simple dengan kalimat yg sama

Present: I drink tea
Past: I drank tea
Future: I will/am going to drink tea


will dipake klo gk ada bukti bahwa hal tsb akan terjadi (Rencana, spekulasi tanpa bukti, dll) sedangkan klo be going to dipake klo ada bukti, contoh: The teacher said that we are going to have an exam next week