Assume is like when you guess something without being sure. Imagine you see a closed box. You might assume there is a toy inside because you usually find toys in boxes. But you don’t really know until you open it. It’s like your brain is making a picture of what might be inside, even though you haven’t seen it yet.
Another way to think about assume is like when you see clouds in the sky and you assume it might rain. You don’t have an umbrella with you, but you think you might need one because clouds often bring rain. Your mind is making a prediction based on what you’ve seen before.
Assuming can also be like when you see your friend smiling and you assume they are happy. You haven’t asked them why they are smiling, but you think they are happy because smiling usually means that. Your brain is using clues to make a guess. But remember, assuming isn’t always right, just like a puzzle piece that might not fit until you try it.