Sometimes it is difficult to understand exactly what is happening.
We can use modal verbs to describe how certain we are about something.
50% / 60% - could - The door could be broken
30/40% - may - The keys may be lost
10/20% - might - He might be a mechanic
0% - can't - He can't be the owner
What do you think is happening in this situation?
You can also use modal verbs to speculate about the past. In this case use the modal verb plus have plus past participle
See here for more examples
and practise here
For more grammar exercises on modal verbs, see this book
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