Should and shouldn't

Welsh General / Questions
#1

I notice from Level 1, Challenge 22 that the colloquial form of “I shouldn’t” is “NA DDYLEN I”
Am I right in the following:

I SHOULD - DDYLEN I

YOU SHOULD - DDYLET TI

YOU SHOULDN’T - NA DDYLET TI

#2

Yes,that’s it.
In addition, you may also hear these variations:
I should - Dylwn i / Fe ddylwn i / Mi ddylwn i
You should - Dylet ti / Fe ddylet ti / Mi ddylet ti
You should (plural) - Dylsech chi / Fe ddylsech chi / Mi ddylsech chi
You shouldn’t (plural) - Na ddylsech chi

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#3

In addition to what Siaron said, this form usually only appears in the middle of a sentence, like this:
He said that I shouldn’t go there. - Dwedodd e na ddylen i fynd yno.
I shouldn’t go there. - Ddylen i ddim fynd yno.
And with ti: You shouldn’t do that - Ddylet ti ddim neud hynny.

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#4

Ah yes - doh! - I didn’t look at the question properly. I must stop trying to multitask.

#5

Diolch Siaron a Hendrik

What about:

He Should - dylet e?
He shouldn’t - na dylet e?
She should - dylet hi?
She shouldn’t - na dylet hi?
We should - dylen ni?
We shouldn’t - na dylen hi?
The should - dylwn nwh
They should’t - na dylwn nwh

#6

The complete conjugation pattern is:
Dylwn i, dylet ti, dylai fe/hi, dylen ni, dylech chi, dylen nhw
For negatives, you add a soft mutation and ddim: Ddylai fe ddim, or if it is part of a subclause, na ddylai fe (and do the same for the other persons with the according endings)

#7

Diolch Hendrik. That is very useful.