（１）I cannot play the guitar.
（２）It cannot be true.
（３）You may not go to the park at night.
（４）You must not swim in the lakes around here.
（５）You don’t have to wait for him.
（６）Can you play the guitar? Yes, I can.
（７）May I ask you a favor?
（８）Must I wait for him? No, you don’t have to.
（９）I can’t say for sure.
（10）Can he speak French? Yes, he can.
（11）May I sit here? Sure.
（12）She doesn’t have to wash the dishes.
（13）He shouldn’t be angry with her.
（14）Must I read the book? Yes, you must.
（15）Must I go now? No, you don't have to.
（16）You may not take a walk around the area.
（17）Her story cannot be true.