or
or
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.
Participle : Verb-এর যে form একই সাথে verb এবং adjective-এর কাজ করে তাকে Participle বলে । Participle তিন প্রকার। যথা :
1. Present Participle 2. Past Participle 3. Perfect Participle
