Staying Safe Online
At the beginning of the story, Lucas and Filipe use their phones to take photos of their teacher and share them with their friends. What problems can this cause for the person who took the photos and for the person in the photos?
During the story, Filipe is sure that someone went onto his Facebook page, and he is sure that he knows who it was. He uses the phrase 'must have been' to show this:
"Someone must have been on my Facebook page!"
"It must have been Rafael"
We use the structure must + have + past participle to show that we are sure about something that happened in the past. We can change must to could/may/might to say that we are less sure, or to can't if we are sure that something didn't happen.
Have a go at the activity below to practise more of these types of sentence. If you want to know more, check out the Grammar Pages on our Learn English website.
"What's going on?"
"What are they on about?"
Have a go at the activity below and see if any of the expressions are new for you.