Shall vs Will When we talk about Shall vs Will , we use them as modal verbs. Shall vs Will are used with main verbs. …
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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)
When we are capable of doing something, but we didn’t complete what was expected to do.
a. He could have got a job, but he didn’t go to Mumbai.
b. She could have got a job in defence, but she didn’t apply for it.
“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.