Modal Verbs of Deduction
Grammar Time: Present and Past Modal Verbs of Deduction Let's focus on using modal verbs of deduction. Exam in Mind Level B1+/B2 Use Modal Verbs of Deduction must (present) and must have (past) when you are very certain that something is/was true can't (present) and couldn't have (past) when you are very certain that something is/was