You _____ be very busy at work. You're always on Tiktok!
can't
They've been running for hours! They _____ be exhausted.
must
The phone _____ be at home. I remember putting it in my bag on my way out.
can't
His car's not here. He _____ have gone out.
must
A: Did you know Ann and Simon have broken up? B: That _____ be true! I saw them together just now.
can't
She's won prizes for her research. She _____ be really intelligent.
must
He lived in Argentina for five years so he _____ speak good Spanish!
must
Do you really think England will win tonight? You _____ be serious! They have no chance!
can't