Grammatical accuracy in everyday English depends on matching words to their structural jobs. When you speak in the present simple, singular subjects require an -s ending on the main verb. When you form questions or negative clauses with do, does, or did, the auxiliary carries the tense and person, leaving the main action verb in its base form. Homophones require choosing the spelling that reflects ownership, place, or contraction. Finally, verbs like listen and explain require the preposition to when connecting to specific objects or recipients.
Maria manages our customer support department and answers inquiries promptly.