We use must and can't to talk about cretainty. 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 cretainty. 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.