but there’s not a goshdarn thing wrong with “don’t,” “can’t,” “wouldn’t,” and all the rest of them that people naturally use, and without them many a piece of writing would turn out stilted and wooden. The likes of “I’d’ve” and “should’ve” are perhaps a bit too loosey-goosey outside casual prose, but generally speaking: Contractions are why God invented the apostrophe, so make good use of both.