Modal verbs: 2- Probability/Possibility: 1- Possibility: We use may , might and could to say that something is possible , but not certain: They may come by car. (= Maybe they will come by car.) They might be at home. (= Maybe they are at home.) If we don't hurry, we could be late. (= Maybe we will be late.) We use can to make general statements about what is possible: It can be very cold here in winter. (= It is sometimes very cold here in winter.) You can easily get lost in this town. (= People often get lost in this town.) Be careful! We do not use can to talk about specific events: A: Where's John? B: I'm not sure. He may / might / could be (NOT can ) in his office. Notice the difference in meaning between can and may / might / could : That dog ...