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ABILITY: Mikes car broke down but fortunately he _____ repair it.
was able to (can is not used for a single occasion)
Oops!
Okay!
ABILITY: They _____ (try) harder to make me feel welcome.
couldn't have tried
Oops!
Okay!
ABILITY: Mozart _____ (play) the piano at the age of five.
could play / was able to play
Oops!
Okay!
ABILITY: I think _____ (I smell) something burning in the kitchen.
I can smell (we don't use "be able to" with senses)
Oops!
Okay!
ABILITY: _____ (I speak) fluently by the end of the course?
Will I be able to speak (can may not be used for a FUTURE ability)
Oops!
Okay!
SPECULATION / DEDUCTION: John isn't here. He _____ (decide) not to come or perhaps he's just late.
could / may / might have decided
Oops!
Okay!
SPECULATION / DEDUCTION: We _____ travel to the moon and Mars, but we _____ travel to Pluto.
will/might be able to / won't/might not be able to (we can't use "can" for future speculation)
Oops!
Okay!
ABILITY: This book _____ (use) by complete strangers.
can be used (we don't usually use "be able to" in the passive)
Oops!
Okay!
ABILITY: Do you think he _____ (climb) Mount Everest?
will manage to climb (this is the best option because it is difficult)
Oops!
Okay!
SPECULATION / DEDUCTION: There _____ (be) life on other planets.
may / might / could be
Oops!
Okay!
She _____ (pay) by credit card, but she used cash instead.
could have paid / was able to pay
Oops!
Okay!
SPECULATION / DEDUCTION: My keys aren't in this bag. I ______ (lose) them.
must have lost
Oops!
Okay!
SPECULATION / DEDUCTION: He _____ (not be) at the party, as he was in New York.
can't / couldn't have been
Oops!
Okay!
SPECULATION / DEDUCTION: You _____ get blood from a stone.
can't (can't means "it's impossible" while couldn't would mean "I think it's impossible")
Oops!
Okay!
SPECULATION / DEDUCTION: Who _____ that be at this time of night?
can / could
Oops!
Okay!
ABILITY: Despite being a mechanic, Mike _____ fix his car when it broke down yesterday.
couldn't / wasn't able to
Oops!
Okay!
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