Comment using must and can't

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Task: Comment on the next situations using possible for the offered context forms of “must be/be doing/have done/have been doing” and “can’t be/be doing/ have done/have been doing”

Example:

She is upset.

She must be a sensitive person. She must be worrying about something. She must have failed the exam.

She can’t be in a good mood. She can’t be laughing. She can’t have spent a great weekend.

He was serious.

He must have found out something. He must have been working on an important project.

He can’t have behaved like an idiot. He can’t have been smiling you back during the meeting.

Your boss looks tired;

Your friend called you in the middle of the night;

There is a strange noise from the next-door apartment;

Some people were discussing something in the middle of the street;

You didn’t congratulate your friend with his birthday.