We use must and can't to talk about certainty. They are followed by the base form of a verb. We use must when we are sure that somthing is true. We use can't when we are sure that somthing is not true.
We use must and can't to talk about certainty. They are followed by the base form of a verb.We use must when we are sure that somthing is true.We use can't when we are sure that somthing is not true.