Do not use round brackets to refer to something that could either be singular or plural, like ‘Check which document(s) you need to send to Rural Payments Wales’.
Peidiwch â defnyddio cromfachau crwn i gyfeirio at rywbeth a allai fod yn unigol neu'n lluosog 'Gwiriwch pa ddogfen(nau) y mae angen i chi eu hanfon at Daliadau Gwledig Cymru'.