Fill in the correct modal verb and form of the infinitive. There was a bank robbery in town this morning and PC Jones was sent to investigate. He's reporting his findings to the Chief of Police. Complete what he says. "Well sir, it 1) must have been (be) a professional gang because it was a very clever job. They 2)... (know) exactly what they were doing because they didn't leave even one clue behind them. It definitely 3) ... (be) Freddy Fingers and his gang because they are in prison. I thought it 4)...(be) Harry but he was in hospital at the time of the robbery, so it 5) ... (be) him either. I 6) ... (be) sure, but it 7)... (be) Sly Steve's gang, because they are the only suspects who don't have an alibi; they 8) ... (commit) the robbery. 9)... (I/ bring) them in for questioning, sir?"
"Well sir, it 1) must have been (be) a professional gang because it was a very clever job. They 2) must have known (know) exactly what they were doing because they didn't leave even one clue behind them. It definitely 3) must be (be) Freddy Fingers and his gang because they are in prison. I thought it 4) must be (be) Harry but he was in hospital at the time of the robbery, so it 5) can't be (be) him either. I 6) can't be sure, but it 7) must be (be) Sly Steve's gang, because they are the only suspects who don't have an alibi; they 8) must have committed (commit) the robbery. 9) Shall I bring (I/ bring) them in for questioning, sir?"
"Well sir, it 1) must have been (be) a professional gang because it was a very clever job. They 2) must have known (know) exactly what they were doing because they didn't leave even one clue behind them. It definitely 3) must be (be) Freddy Fingers and his gang because they are in prison. I thought it 4) must be (be) Harry but he was in hospital at the time of the robbery, so it 5) can't be (be) him either. I 6) can't be sure, but it 7) must be (be) Sly Steve's gang, because they are the only suspects who don't have an alibi; they 8) must have committed (commit) the robbery. 9) Shall I bring (I/ bring) them in for questioning, sir?"