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- 현재의 가능성/확실성의 정도에 따라 다음과 같다.
Why isn't John in class?
He is sick.(100%)
He must be sick.(95%)
He may/might/could be sick.(50% 이하)
- 현재의 부정적 가능성/확실성
Sam isn't hungry.(100%)
Sam couldn't/can't be hungry.(99%)
Sam must not be hungry. (95%)
Sam may/might not be hungry. (50% 이하)
- 과거의 가능성/확실성
She was sick. (100%)
She must have been sick.(95%)
She may/might/could have been sick.(50% 이하)
- 과거의 부정적 가능성/확실성
Sam wasn't hungry.(100%)
Sam couldn't/can't have been hungry.(99%)
Sam must not have been hungry.(95%)
Sam may /might not have been hungry.(50% 이하)
- 미래의 가능성/확실성
Kay will do well on the test.(100% 확신)
She should/ought to do well on the test.(90%)
She may/might/could do well on the test.(50% 이하)