That noise .... be a cat. It's a baby's cry.
CAN'T
He's wearing a white uniform. He ..... be a doctor.
MUST
I'm not sure what she's doing. She ... be doing her homework.
COULD / MIGHT / MAY
Lulu hasn't eaten anything since yesterday. It .... be hungry now.
MUST
Jack is traveling to Europe. I'm sure he ... be visiting Hanoi now.
CAN'T
Where's he from? - I don't know. He ... be from Italy.
COULD / MAY / MIGHT
The baby ... be sleeping. I've heard his voice.
CAN'T
Lily ... be playing with Tony in the garden. Go and see.
COULD / MAY / MIGHT
Lana looks exhausted. She ... have worked hard.
MUST
John is very happy. He ... have passed the final exam with a high score.
MUST
The lion is injured. It .... have had a fight with another lion, but I'm not sure.
MAY / MIGHT / COULD
Lucy took the quiz last week. She ... have been absent.
CAN'T / COULDN'T
The room looks so messy. I'm sure they ... have had a party last night.
MUST
