The document provides a grammar exercise where students are asked to fill in the blanks of 20 sentences with the correct present simple verb form. The sentences test the use of common present simple verbs like "walk", "drink", "like", "play", "dance", "work", "eat", "study", "live", "close", "know", "call", "talk", "leave", "speak", "cook", "take", "travel", and "mean" in both affirmative and negative constructions.