Tom and Mary don't seem to understand why they aren't supposed to do that.
- Tom and Mary don't seem to understand why they're not supposed to do that.
Tom and Mary don't seem to understand why they're not supposed to do that.
- Tom and Mary don't seem to understand why they aren't supposed to do that.
It's usually easy for Norwegians to get what Swedes are saying.
- It's usually easy for Norwegians to understand what Swedes are saying.
If Tom had been speaking French, I would have been able to understand him.
- If Tom had been speaking French, I would've been able to understand him.
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