A friend of mine (whose first language isn’t English) recently asked me how to contract “they are”, to which I replied “they’re”. The same person then asked how to contract “there are”, to which I replied “there’re” (I was speaking not writing at the time). I was then asked by said person to show them how to write these contractions, to which I pointed out that we hardly ever use these in written English and, if you ever do, the majority of people will probably tell you they’re (sorry — I mean: “they are”) wrong. I then wondered how many other commonly-spoken-but-rarely-ever-written contractions there’re (sorry, ahem, “there are”) in this crazy language we call English…
Here’s a little (and by no-means complete) list: