paragraph we've all heard it b4

How quickly can you find out what is unusual about this paragraph? It looks so ordinary that you would think that nothing was wrong with it at all and, in fact, nothing is. But it is unusual. Why? If you study it and think about it you may find out, but I am not going to assist you in any way. You will soon find out that this is simply a thing you should know already, this paragraph is almost through. You must do it without coaching. Although this isn't much of a riddlish paragraph, you still must find out why it is unusual. No doubt, if you work at it, it will dawn on you. Who knows? Go to work and try your skill. Par is about half an hour.