Use of Modals in progressive form

Work going on
He will be facing the interview tomorrow. (100 % surety of facing the interview tomorrow)
He may be facing the interview tomorrow. (50 to 60 % surety of facing the interview)
He might be facing the interview tomorrow. (20 to 30 % surety of facing the interview)
He must be facing the interview tomorrow. (He needs a job anyhow; therefore, up to 90 % surety of facing the interview)

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May have/Might have & Must have: Modals

“May have and might have” are used to express the possibility or chances of work being done in the past.
Might have–20 to 40% guess of something means chances were less to complete the task. “Might have” used for a complete guess or speculation for the past situation.
May have–50 to 60% chances of doing work. It shows more chances to complete the job.
Must have ¬-
It makes sure that action takes place with strong affirmation. It is sure that action definitely happened.

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