For questions relating to the
object of the sentence, the present tense
oes is used:
Oes pysgod yn y llyn? Oes Nag oes
Are there fish (object) in the lake? There are There are not
For questions relating to the subject of the sentence, the present tense ydy is used:
Ydy'r pysgod yn y llyn? Ydyn Nag ydyn
Are the fish (subject) in the lake? They are They are not
(rather than somewhere else...)
Questions can be produced by simply speaking in a questionning manner:
Siaradodd hi yn y cyfarfod? Did she speak in the meeting?
However, the presence of a question can be signalled by placing A or Ai at the start of the sentence:
Ai eich frindiau ydy'r rheina? Are these your friends?
The word 'A' causes a soft mutation:
Bydd cacen i de There will be cake for tea
A fydd cacen i de? Will there be cake for tea?
The soft mutation occurs with question forms, even when the 'A' is imaginary:
Welodd e'r ddamwain? Did he see the accident?
A question can be created by making a statement, then adding a question phrase at the end. For example:
Mae'n oer heddiw, ynte? It is cold today, isn't it?
Questions are often created using the interrogative words:
pwy? (who), beth? (what), lle? (where), pryd? (when), pam? (why),
sut? (how), pa? (which), sawl? (how many), faint? (how many/much):
Pwy yw'r enillydd? Who is the winner?
Beth yw'r broblem? What is the problem?
Pryd mae'r siop ar agor? When is the shop open?
Pam ydych chi'n gwerthu'r car? Why are you selling the car?
Sut mae'r llawr yn cael ei lanhau? How is the floor cleaned?
Pa lyfr ydych chi'n ei ddarllen? Which book are you reading?
Sawl brawd sydd gennych chi? How many brothers do you have?
Faint o goed sydd yn yr ardd? How many trees are in the garden?