"I want eleven lemons."
Translation:Dw i eisiau un deg un lemon.
Okay "Moyn" is a verb that means "To want" so has the construction "Dw i'n moyn.." (I want). "Eisiau" and "isio" are both variants of the same noun which we use ti express "To want" and uses the construction "Dw i eisiau/isio" (Note the lack of the "'n" due to eisiau/isio not being a verb. They all have the same meaning except "Moyn" is used in southern dialects and "Isio" in northern dialects with "Eisiau" being a more formal form of "isio" (though it may be used in some dialects).
The traditional forms are generally less used nowadays except in telling the time and, as ordinals, in dates. Those are the situations in which we cover them on the course.
The traditional numbers are used in a different way from the decimal numbers, too:
- un deg un lemon (decimal) - un lemon ar ddeg (vigesimal)