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a and ac both mean and but how are they used? Look at these sentences but focus in particular on the use of a and ac.

Dw i’n hoffi bwyta pysgod a sglodion. – I like eating fish and chips.

Dw i’n hoffi bwyta bananas ac afalau. – I like eating bananas and apples.

Es i i mewn i’r ystafell a siaradais i â John. – I went into the room and I spoke to John.

Es i i mewn i’r ystafell ac eisteddais i ar y gadair. – I went into the room and I sat down on the chair.