The simple present tense is used to describe things that are repeated or always true. We use it to talk about habitual actions like "Emma gets up at seven o'clock" or general truths like "They like fish." The form of the verb depends on the subject - third person singular takes an -s ending. Negative forms use "don't" for I/you/we/they and "doesn't" for third person singular. Questions use "do" or "does" before the main verb.