Why can't you say "ós do chomhair" here?
You could say os do chomhair (os rather than ós), but the course creators might not have anticipated that as part of a correct answer.
Can someone please explain why Níl is used here instead of Ní? Thanks
Why is dinnéar not linited?
There is nothing in this sentence that would cause lenition. Why did you think it would be lenited?