Great question! every and each: For the *most* part, we use 'every' more often. If you are unsure which to use try using every and ask the person you are speaking with if you were correct. 'Each' implies singling out one item one by one, whereas 'every' is used more generally. However, native English speakers use them interchangeably and the difference is very subtle. Again, try using them more often with native speakers and ask them how you can improve. As for 'someone' and 'somebody' the difference is even more subtle. Perhaps none at all. I use both in my speech and to choose which one I use it usually has to do with which one sounds better. 'Someone' and 'somebody' mean the same thing and you can choose which one you prefer by personal preference. 'Someone' is slightly more formal, so I use this more when I'm trying to be very polite or sound well educated. Other than that they mean exactly the same thing! I hope this helps! CE