Rephrase "Take your umbrella. It's possible that it will rain"
Take your umbrella. It MIGHT rain
Rephrase "I recognise your face. I'm certain we've met before"
I recognise your face. We MUST HAVE MET before.
Rephrase "Lucy can't find her laptop. It's possible that she left it on the train"
Lucy can't find her laptop. She MIGHT HAVE LEFT it on the train