The document discusses the present simple tense in English. It explains the positive, negative, and interrogative forms of the present simple tense. For the positive form, most verbs are the same as the infinitive, except for the third person singular which adds -s or -es. The negative is formed using do/does + not. Questions are formed using do/does + subject + infinitive. The present simple is used to express habits, routines, scientific truths, and things that are generally true over a long period of time.