These exercises focus on basic English grammar rules for beginner level, such as using the present simple tense, expressing existence with "there is/there are," distinguishing between countable and uncountable nouns, and using subject pronouns. The exercises also cover forming questions with "wh-" words, using the articles "a" and "an," and applying the verb "to be" in sentences. These exercises aim to improve students' ability to construct correct sentences and understand the proper use of tenses and grammatical tools in English.