Cornish also repeats the verb instead of having a common, invariable word for yes/no.
I've heard a number of learners avoid that by responding with something like "Gwir / Dhe wir / Yn hwir" (True / Truly) :)
On the other hand, since many people form sentences with helping "do", you can get by with learning only the response forms for that verb. (A bit like how learning the forms of bod can get you pretty far in Welsh.)
- Welsh: Wyt ti'n cysgu? Ydw. (Are you sleeping? I am.)
- Cornish: A wre'ta koska? Gwrav. (Do you sleep? I do.)
- or: Esos ta ow koska? Esov. (Are you sleeping? I am.)
If, on the other hand, someone asked you "A goskydh?" (Sleep you?), you would have to answer "Koskav." (I sleep.) - and since many people are not used to conjugating verbs, this can get tricky :) Most verbs are used in their verbal noun form together with a helping verb in daily usage.
I've even heard the theory that the use of "do-support" for questions and negative sentences in English comes from the Brythonic languages, i.e. Cornish and/or Welsh (or their common ancestor).
It is similar in Irish.
- An bhfuil tú i do chodladh? Táim. (Are you asleep? I am.)
- An gcodlaíonn tú? Codlaíonn. (Do you sleep? Sleeps.)
- An dtéann sí ar scoil? Téann. (Does she go to school? Goes.)
Yes. There is no single 'yes/no' in Welsh - it always depends on the tense/person. For short- past tense, 'do/naddo' is 'yes/no' for all persons.
Here's a link to nice guide on yes/no in Welsh: http://www.bbc.co.uk/wales/learnwelsh/pdf/welshgrammar_ff_replies.pdf
Yes. The good news is once you get out of present tense, there don't tend to be different forms for person and number. Whereas we use "Ydw", "Wyt," "Ydy", etc. and "Nac ydw", "Nac wyt", "Nac ydy", etc. in present tense, in the conjugated past tense it's just "Do" and "Naddo".