its 和 it's 差在哪

来看 its 和 it's 的区别：

1. it's = it has 或 it is
   It's cold outside.（外面冷。= It is cold outside.）
   It's been nice seeing you.（见到你很高兴。= It has been nice seeing you.）

2. its = it 的所有格
   The dog wagged its tail.（狗摇了摇它的尾巴。这条尾巴是狗的。）