They would often work with Yr Anhrefn , either supporting them in their concerts or doing the reverse , when Y Cyrff were booked as the lead act .
PRON AUX ADV VERB ADP PROPN PROPN , CCONJ VERB PRON ADP PRON NOUN CCONJ VERB DET NOUN , ADV PROPN PROPN AUX VERB ADP DET ADJ NOUN .