Rob must have eaten Dans cake!
Dan was looking forward to eating a piece of cake hed brought into the BBC. But when he looked for it in the fridge, it was gone. Hes sure Rob took it because hes done that before.
How do you use modal verbs in the past to express that idea? Dan has a 90-second lesson to explain all.
For more, visit our website: www.bbc.co.uk/learningenglish/english/course/upper-intermediate/unit-25/session-1