Learning how to say what you don’t do in Swahili is just as important as saying what you do. One of the most interesting parts of Swahili grammar is how present tense negation works. It is not just adding a word like “not” as in English. Instead, three things change at the same time: the subject prefix, the tense marker, and sometimes even the verb itself. Let’s break it down in a simple way. In a normal present tense sentence like: Ninacheza. I am playing. To make it negative, three steps happen: First, the subject prefix changes 'ni' becomes 'si'. Second, the present tense marker 'na' disappears Third, the verb may change depending on its origin So the final result becomes: Sichezi. I am not playing. Now here is where it gets interesting. With most Swahili verbs (Bantu origin), the last vowel changes from “a” to “i” cheza becomes chezi pika becomes piki soma becomes somi Examples: Ninapika. → Sipiki. I am cooking. → I am not cooking. Unasoma. → Husomi. You are reading. → You are not reading. But not all verbs behave this way. Some verbs, especially those borrowed from Arabic, do not change their final vowel at all. Examples: Ninarudi. → Sirudi. I am returning. → I am not returning. Unafahamu. → Hufahamu. You understand → You do not understand So now you have two patterns to think about: Some verbs change at the end Some verbs stay the same This is where many learners get confused, but also where things start to feel more like a system than memorization. A good way to practice is to take any verb you know and try to negate it. Then ask yourself: Does the ending change or stay the same?