Grammar is awesome you have Johanna's Jacob's and its . Because it's is a contraction of it is. But is it Thomas' book or is it Thomas's book? You get through and thru , as in Drive-Thru which in case you're wondering was the first way ever I saw that word spelled, on the Drive-Thru at Burger King. Then there is your and you're . "Your bandanna mean's you're a hippy, Eeyore..." And honestly I had not grasped that these was the plural of this until I was in college. But for all this confusion and cases, (it's weird yet niece, nice, and Nice but Einstein?) it's all good. The flexibility of the language allows for all of it. Until you get the grammar police. Taking perfectly understandable sentences and dubbing them wrong for not being spelled right or following the right grammar. I love that as a writer I can just claim poetic licence whenever I so want. So sanguine and it's bloody name can be in my writing blood-thirsty and not...