3 - I have aheadache. I should have caught flu.

1 - I have a headache . I may have caught flu.

2 - I have a headache . I was supposed to catch flu.

1 - They weren't supposed to move away . Their car is outside the house .

2 - They shouldn't have moved away . Their car is outside the house .

3 - They couldn't have moved away . Their car is outside the house

1 - She was supposed to get stuck in traffic . There was a big accidents .

2 - She must have gotten stuck in traffic . There was a big accidents .

3 - She could have gotten stuck in traffic . There was a big accidents .

1- You missed the bus . You were supposed to come at 10:00.

2 -You missed the bus . You may have come at 10:00.

3 -You missed the bus . You must have come at 10:00.

2 -I was sick . I may not have eaten that soup .

3 -I was sick . I wasn't supposed to eat that soup .

1 - I was sick . I should't have eaten that soup .