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English grammar: simple vs. perfect past tense

Today, I'll explain when to use SIMPLE PAST TENSE and PERFECT PAST TENSE. First of all, what are they?  We use past tenses to talk about things that have happened in the past, so we can only change the tense of a verb. Below are some examples: Root verb - simple past - perfect past run  … Continue reading English grammar: simple vs. perfect past tense