[ Modals ]
Perhaps, Tina is vacuuming the house.
A. Tina must be vacuuming the house.
B. Tina can’t be vacuuming the house.
C. Tina could be vacuuming the house.
Select your answer:
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Modal Possibilities › ViewWhich modal of possibility is used to express a strong possibility or certainty?
A. will
B. could
Grammar › View
Something _________ happened or they would be here by now.
A. must
B. must be
C. must have
D. must have been