The thief ran right past you, so I'm sure you saw his face. (have) -> You ……………… the thief's face because he ran past you.
The thief ran right past you, so I'm sure you saw his face. (have)
-> You ……………… the thief's face because he ran past you.
The thief ran right past you, so I'm sure you saw his face. (have)
-> You must have seen the thief's face because he ran past you.