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Everyone in the class ...(work) incredibly hard because you have all passed the exam!
must have worked
I think she (be) a really happy person because she’s always smiling and laughing.
must be
Jamie woke up in the night screaming. He (have) a nightmare.
must have had
I don’t know why Irina hasn’t arrived yet. She (have to) stay on late at school, or she (stop) on the way home to see some friends.
may have had to ,may have stopped
I don’t know how old the teacher is, but he looks quite young, so he (be) more than 25.
can’t be
They say it (rain) at the weekend, so maybe we should cancel the football match on Saturday.
may rain
