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Help the amateur detective solve the mystery of the missing chocolate cake by choosing the best deductions.
The kitchen window was locked from the inside, so the thief _________________________ entered through the garden. However, there are large, muddy paw prints on the counter, so Buster the dog _________________________ eaten the entire dessert!
The correct answers are can't have and must have.
We use can't have + past participle when we are almost certain that something did not happen in the past (it's logically impossible because the window was locked).
We use must have + past participle when we are almost certain that something did happen based on strong evidence (the muddy paw prints).