Ha, excellent question! I actually wrote a blog post about it (just an introduction): http://www.oegugin.com/2014/02/28/linkings-in-french/ Basically, there are two kinds of linkings. "Enchaînements" are done all the time, but "liaisons" can be compulsory, optional, or forbidden. Here are some examples: Enchaînements: "Je parle avec elle" sounds like "je-par-la-vè-kèl" Liaisons obligatoires: "mes amis" sounds like "mé-za-mi" Liaisons optionnelles: "ils vont à Paris" can sound like "il-von-a-pa-ri" or "il-von-ta-pa-ri" Liaisons interdite: "lui et elle" sounds like "lui-é-èl" (you can never pronounce that T) I hope this helps! :)

We had a former discussion on this subject, feel free to have a look : https://www.italki.com/question/373560