As asked here about the difference between "some" and "not all". I'm looking for a practical example in real world where these two can be applied. Do we have a situation where we can use either of them? Are these two merely based on how we infer things? I came up with this example:
Suppose, we enter a hall where we find that there are five individuals. We suppose that one of them is American and four of them are Italians. So, Should we conclude that "Some are American" or "Not all are American" since both would be true, right? Now, if later on we find that the one person we met wasn't an American then would our conclusion "Not all are American" still be true?