Prepositional Phrases
From Scottish Gaelic Grammar Wiki
When the complement of the preposition is indefinite
le peann. with pen 'WIth a pen.' (Adger 2000)
Do taigh. to house 'To a house.' (Adger 2000)
When the complement of the preposition is definite
leis a' pheann. with.def the pen 'WIth the pen.' (Adger 2000)
Dhan an taigh. to.def the house 'To a house.' (Adger 2000)