In each pair of sentences, there is one correct and one incorrect sentence. Tick (✔) the correct sentence.

1. Danny only started his homework ten minutes ago. He can't have finished it.

Danny only started his homework ten minutes ago. He must have finished it.

2. Harry and I were cycling to school while we saw Lucy.

Harry and I were cycling to school when we saw Lucy.

3. Jack isn't answering his phone. He might have left it at home.

Jack isn't answering his phone. He can have left it at home.

4. Julie realised she left her bag on the bus.

Julie realised she'd left her bag on the bus.