Use will plus a base verb: I will call, she will call, and they will call. Use it for a prediction, a decision made now, an offer, or a promise. Add not for a negative, and put will before the subject for a question.
For a simple past negative, use subject plus did not or didn't plus the base form of the verb. Use did not leave, did not go, and did not see. Do not put the verb in the past form after did not.
Use the simple past for an action that started and finished in the past. Most regular verbs add -ed, while irregular verbs have past forms to learn, such as go - went and buy - bought.
Use the simple present for habits, schedules, and facts. Add -s or -es after he, she, and it in affirmative sentences; use do or does plus the base verb in negatives and questions.
Use the base verb with I, you, we, and they. With he, she, and it, add -s or -es to most ordinary verbs. Learn the separate forms of be, do, and have: she is, she does, and she has.
Use the simple present for something that happens regularly or is true in general. Write I work and they work, but he works, she works, and it works. Use do or does for most questions and negatives.
For a clear simple sentence, give the reader a subject, a verb, and a complete idea. In a statement, the usual order is subject then verb. Add an object, description, time, or place when the verb needs more information.