Its+名词，意思是它的...Its head is small.它的头很小。Its=It is，意思是它是...It's my book.它是我的书。这组词和you和your区别不一样。you意思是“你；你们”You are my friend.你是我的朋友。your意思是“你的；你们的”This is your book.这是你的书。
前者相当于her，his，my，there，都是“它的”的意思，而后者为“它是”举个例子：Its fur is long（它的毛发很长）It's a dog with long fur（它是一只有长毛的狗）
aVery few people were coming to eat at the White Rose Restaurant and its owner did not know what to do. The food in his restaurant was cheap and good, but nobody seemed to eat there. Then he did something that changed all that, and after a few weeks his restaurant was always full ...