Sure. I'm Irish. I've been a professional writer for about thirteen years. Formality of sentence construction is context dependent. In prose there's usually little purpose and no solid grammatical rule for retaining superfluous words. Depending on the pace and rhythm of the piece - which in turn dictate interesting things like the readers perception of time. For example you can make time flow faster by using brief, truncated, staccato sentences. Or stretch it out with more formal, grandiloquent sentences. You can also convey the informality of a relationship, or even the physical structure of space or an object in much the same way. These are elements of voice - the character or tone of the sentence or paragraph, which is contextualised by the overall piece. I'm not articulating theory here - more trying to convey how I and other writers intuitively learn to play with prose.