MODALS & PERFECT MODALS
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I'm sure he's at home --- HE ___ AT HOME
HE MUST BE AT HOME
It's impossible that he knew the problem ---- HE ............. THE PROBLEM
HE CAN'T HAVE KNOWN THE PROBLEM
I'm sure they didn't phone you --- THEY __________ YOU.
THEY CAN'T HAVE PHONED YOU.
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