Do not and have not

In the SSiW Level 3 course (Southern Welsh) I have heard Aran introduce the expression SA’I meaning “I don’t” and “I haven’t” Are there similar short-form expressions for the following (southern Welsh)

You don’t
You haven’t

You don’t (plural and formal)
You haven’t (plural and formal)

He doesn’t
He hasn’t

She doesn’t
She hasn’t

We don’t
We haven’t

They don’t
They haven’t

Yes, this colloquial short form exists for other persons as well, and for all other persons except 1st person singular it’s simply so. But be careful with the meaning “haven’t”: this translation is only correct in cases where have is used as an auxillary verb forming the past tense:
He hasn’t been here - So fe wedi bod yma
(And a side note: It proably was Iestyn, the voice of the southern course. Aran lends his voice to the northern course.)

Diolch Hendrik. To confirm

SO TI - You don’t
SO CHI - You don’t (plural and formal)
SO FE - He doesn’t
SO HI - She doesn’t
SO NI - We don’t
SO NHW - We don’t

I don’t quite understand the grammatical “nuance” that you referred to with respect to the meaning of ‘hasn’t’ could you give me a few more examples. Are the following OK

SO FE WEDI COLLI…
SO FE WEDI DRINGO’R WAL
SO HI WEDI RHOI Y LLIVRE…
SO HI WEDI WNEUD E

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