The correct answer is 'if I tried.' Key Points - If the other clause is mentioning something that happened in the past, then If clause with past indefinite tense will be used. - We often use if to introduce possible or impossible situations or conditions and their results. - The situations or conditions can be real, imagined, or uncertain. - Example: I usually make a sandwich to take to work if I have enough time. - Hence, 'if I tried' should be used to make the sentence grammatically correct. - Correct Sentence: I couldn't be angry with him if I tried.