I've written a computer program to construct Cornish sentences. Before you ask, it is ethically aware: people cannot be bought, sold or eaten...
Here's a sample output showing a number of different sentence structures:
Piw a ladhas an tas? - Who killed the father?
Piw a welas an diwros na? - Who saw that bicycle?
Yw an chi drog? - Is the house bad?
Yw an pasti kottha? - Is the pasty oldest?
A nyns yw an chi yeyn? - Isn't the house cold?
Yw an lyver an kottha? - Is the book the oldest?
A garas ev onan myrgh drog? - Doesn't he like one bad horse?
A ny brensys jy chi an nowyttha. Didn't they buy the newest house?
Ny wrewgh hwi ladha deg broder kottha. - You didn't kill ten older brothers.
A ny vynnons i gweles diwros drog? - Didn't they see the a bad bicycle?
A vynnsys jy gul gwin an yeynna? - Did you make the coldest wine?
A welons i gwin gans an diwros nowydh? - Did they see wine with the new bicycle?
I a wra gwin. - They make wine.
I a bren pasti bras. - They buy a big pasty.
Ni a wre gweles etek hwoer. - We used to see eighteen sisters.
I a yll gwertha kath berr. - They can sell a short cat.
Ny gar hi seytek hwedhel. - She doesn't like seventeen stories.
Ty a brena pasti yn-dann an karr. - You used to buy a pasty under the car.
Ev a bren gwin war gwin an kottha. - He buys wine on the oldest wine.
Ni a wra ladha ki war ervin. - We kill a dog on turnip.
Hwi a vynna kara bugh war chi nowydh. You used to want to like a cow on the new house.
Ny werthydh jy kath yn-dann kyttrin. You don't sell a cat under a bus.
Ny yllons i prena gerlyver. - They can't buy a dictionary.
Ni a bren hy arghans. - We buy her money.
Hi a wela hy hath lent. - She used to see her slow cat.
Ty a wre gwertha agan jynn-tenna. - You used to sell our tractor.
Ni a vynn prena hy chi berr. - We want to buy her short house.
Ny wredh jy aga arghans. You don't make their money.
Ni a wre aga chi heb an ki. We used to make their house without the dog.
Hwi a brenas dha ji heb myrgh an berra. You bought your house without the shortest horse.
Hwi a allas dybri pasti yn-dann agas hogh. You can eat a pasty under your pig.
Ni a vynn kara kath gans y gi drog. We want to like a cat with his bad dog.
Ny garons i chi gans ow horev. - They don't like a house with my beer.
Ny vynnsons i prena ow fasti. They don't buy my pasty.
An kath a wela arghans. - The cat used to see money
An broder a vynnas kara karr nowyttha. - The brother wanted to love a newer car.
War diwros y pren ev an bugh. On a bicycle he buys a cow.
Yn-dann aval-dor y hwerthas ev arghans. Under potato he sold money.
Hy hogh a garas broder berr. - Her pig liked a short brother.
Hy bugh a ylla kara lyver an nowyttha. - Her cow use to be able to like the newest book.
Ny garas an margh karr byghan. The horse didn't like a small car.
An chi hag a welis vy. - The house that I saw.
An den na ladhens i. - The man they didn't kill.