Mert vs ugyanis vs mivel
I would be really grateful if anyone could explain the differences (if any) between these three words. Many thanks in advance.
"Mert" and "mivel" are completely interchangeable.
"Ugyanis" carries the same meaning, but has a slightly different shade: it is more explanatory. The former two means a simple "because", but "ugyanis" means that you will give an explanation.
yes, but as HirundoPrima pointed out, you would better opt for "mert" or "mivel". If you'd use "ugyanis" in every occurrence, you sounded like a know-it-all. Almost as if you started all your English sentences with: "To let you know..."