Prepositions
In Welsh, prepositions frequently change their form when followed by a pronoun. These are known as inflected prepositions. Most of them, such as dan, follow the same basic pattern:
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Singular Plural First Person dana i danon ni Second Person danat ti danoch chi Third Person Masculine dano fe/fo danyn nhw Feminine dani hi
There is some dialectal variation, particularly in the first and second person singular forms. In some places one may hear dano i, danot ti, or danach chi.
The majority of prepositions trigger the soft mutation.
Read more about this topic: Colloquial Welsh Morphology