Matching Pairs matching BOnline version matching when and while by Kristina Topalova 1 The fire alarm rang while... 2 We were waiting for the firefighters when... 3 Mr Carter took all our names while... 4 Joe was painting when... 5 A boy fell over while... he was running out of the building. I was doing a science experiment. he heard it. we were standing outside. we saw the smoke.