a (rhagenw perthynol/relative pronoun):  - y dyn a welaist [gwelaist]; the man that you saw
(geiryn gofynol/interrogative particle):  - A welaist y dyn [gwelaist]; did you see the man
a (cysylltiad/conjunction):  - ci a chath [cath]; dog and cat
â (arddodiad/preposition):  - ci â chath [cath]; dog with a cat
am (arddodiad/preposition):  - 'rwyf yn mynd am dro [tro]; I am going for a walk.
ar (arddodiad/preposition):  - 'rwyf ar goll [coll]; I am lost.
( mewn paratoad )