Must have +Past Participle is a match for—
- We have done the sum
- We must do the work
- They must have to finish the duty
- He must have neglected his studies
Answer: He must have neglected his studies
Explanation: We use must have + past participle when we feel sure about what happened.
Who told the newspapers about the prime minister’s plans? It must have been someone close to him.
The thief must have had a key. The door was locked and nothing was broken.
Oh, good! We’ve got milk. Mo must have bought some yesterday.