English Grammar Hi friends, this English grammar has confused me for a long time. I almost always don't know which tense I use in this context. Could you tell me which one is right and why? Could help me check the sentences I sent you because "I don't know if I have used it right or not" or I should say "I don't know if I used it right or not." Could you help me check the sentences I sent you because "I don't know if I have typed it right or not" or I should say "I don't know if I typed it right or not."