supergreatfrien:

Ok, grammar lesson.  A common event that you’ll see in the English language is two letters next to each other in a word (who love each other very much) will get married.  At this point, they cease to live their lives as individual letters, and start a new life as a married couple.  When this happens, they no longer make sounds distinct from one another, but rather the combination creates a single, new sound.  In the word “daddy,”, the two latter Ds are a married couple, so you don’t pronounce them as individual Ds, but instead it’s more like a single D, but extended a little bit.

You might wonder how you can tell which letter pairs are married.  The answer is that you’d need to ask for their marriage license, but that’s considered rude.  You just need to figure it out from context.  How do their friends talk about them?  Do the two Ds always refer to each other as “we?”  Try not to make a social faux pas when guessing the letters marital status.