P-Celtic and Q-Celtic are still perfectly acceptable ways of denoting these two strands of Celtic language development, thank you very much.
Sorry, but they're really not. They imply a closer relationship between Brythonic and Gaulish on the one hand and Goidelic and Celtiberian on the other than is really justified. In fact, the evidence suggests that the shift of *kʷ to *p happened independently in both the Brythonic and Gaulish branches. Goidelic and Celtiberian may have resisted the change simply because they were more peripheral varieties. Lumping them both together as "Q-Celtic" makes about as much sense as lumping together Anglo-Frisian (including English) and Low Franconian (including Dutch) with Gothic as "W-Germanic" and all remaining West and North Germanic varieties as "V-Germanic".
If you have problems confusing Welsh and Irish, that's probably because you learned the one and then started the other. I thought Jan was talking about learning two languages together.
I'm not sure why starting them both together would make a difference. It's still confusing to know, for instance, that Níl ionam ach tosaitheoir
is correct Irish but *Nid yw yno fi ond dechreuwr
simply doesn't work in Welsh, and likewise for Dw i ddim ond dechreuwr
and *Nílim ach tosaitheoir
. This holds true regardless of the order you learn these in.
Actually, there is one word that confuses me - gan means with in Welsh and without in Irish, if I remember correctly.
Efallai'n eironig nid yw hyn yn broblem i fi achos mod i'n siarad Hwntw a nid oes ond "gyda" mewn 'nhafodiaith i!