Complete the second sentence so that it means the same as the first. Use modal verb

I. Complete the second sentence so that it means the same as the first. Use modal verb.
1. I'm sure we're not late because we left on time.
---> We left on time so........ late
2. It's possible that tomorrow's match will be cancelled.
----> Tomorrow's match ............ cancelled.
3. Lunch was provided so it wasn't neccessary for them to take sandwiches ( need )
4. John isn't in Rome - I saw him earlier ( can't)
5. It would have been better if you'd listened to my advice (ought)
6. Why didn't you introduce me to your friends ? ( might)