This document compares and contrasts the simple past and present perfect tenses in English. The simple past is used to describe actions or situations that are completed in the past, while the present perfect connects the past to the present by describing actions or situations that began in the past and continue to the present or are relevant to the present. Examples are provided to illustrate the difference in meaning between sentences using the simple past versus the present perfect. Time expressions that are commonly used with each tense are also outlined.