1. Time to stop
• It's almost time to stop.
• I'm afraid it's time to finish now.
• We'll have to stop here.
• There's the bell. It's time to stop.
• That's all for today. You can go now.
2. Not time to stop
• The bell hasn't gone yet.
• There are still two minutes to go.
• We still have a couple of minutes left.
• The lesson doesn't finish till five past.
• Your watch must be fast.
• We seem to have finished early.
• We have an extra five minutes.
• Sit quietly until the bell goes.