A
Something difficult to explain
mysterious
Something unusual
odd
Something confusing
puzzling
A being from another planet
extraterrestrial
Hidden information
secret
The lights are off and everyone is quiet.
PRESENT DEDUCTION: MUST
They .................. sleeping
They must be sleeping
She has a white coat and glasses.
PRESENT DEDUCTION: MIGHT
SHE ....................... a scientist
She might be a scientist
Nobody is answering the door.
PRESENT DEDUCTION: CAN´T
They ........................... home.
They can’t be home.
The dog is looking at the food.
PRESENT DEDUCTION: COULD
It ....................hungry.
It could be hungry.
There are wet umbrellas everywhere.
PRESENT DEDUCTION: MUST
It .................... raining.
It must be raining.
The cake disappeared from the table.
PAST DEDUCTION: MUST
The dog ........................ (EAT) it.
He dog must have eaten it.
The window is broken.
PAST DEDUCTION: MIGHT
Someone ........................ (BREAK) it.
Someone might have broken it.
The strange lights disappeared quickly.
PAST DEDUCTION: COULD
People ....................... (IMAGINE) them.
People could have imagined them.
The secret code was solved immediately.
PAST DEDUCTION: MUST
A genius ....................... (SOLVE)it.
A genius must have solved it.
The classroom is clean now.
PAST DEDUCTION: CAN´T
The students .................... (MAKE)the mess.
The students can’t have made the mess.
A strange figure appeared at midnight.
PAST DEDUCTION: MIGHT
It .......................a ghost.
It might have been a ghost.
Odd lights moved across the sky.
PAST DEDUCTION: COULD
They ..................... (BE) drones.
They could have been drones.
Mysterious writing appeared on the wall.
PAST DEDUCTION: MUST
Someone .......................... (WRITE) it.
Someone must have written it.
A puzzling message arrived yesterday.
PAST DEDUCTION: MIGHT
A friend ....................... (SEND) it.
A friend might have sent it.
An extraterrestrial spaceship landed nearby.
PAST DEDUCTION: CAN´T
It ....................... (BE) real.
It can’t have been real.
He studies all day and gets excellent grades.
PRESENT DEDUCTION: MUST
He ...................(BE) very intelligent.
He must be very intelligent.
The room is dark but I hear voices.
PRESENT DEDUCTION: MIGHT
Someone ..................... (BE) inside.
Someone might be inside.
She hates chocolate. The cake disappeared.
PAST DEDUCTION: CAN´T
She ......................... (EAT)it.
She can’t have eaten it.
The alien disappeared before the police arrived.
PAST DEDUCTION: could
It ............................(escape).
It could have escaped.
The floor is wet after the storm.
PAST DEDUCTION: MUST
It .......................... (RAIN).
It must have rained.