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