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it’s——possessive form of “it”是“it”的所有格，它是形容词性的物主代词，代替上面已出现过的事或动物，意思是“它的”。例如：
  1. It has no arms， but its hands turn round and round.
  它没有臂，但它的手围绕地转。
  2.The cat drank its water and washed its ears.
  这只猫喝了水，洗耳朵。
  it’ s——short form for “it is”或short form for“it has”是“it is”或“it has”的缩写形式，意思是“它是”。例如：
  1. It’s raining now. （=It is raining now . ）
  现在正在下雨。
  2. It's rained for a week. （= It has rained for a week. )
  已经下了一星期雨了。Ex.用it’s或its填空：
  1.The book has lost____cover
  2．____a long way to go.
  3. “Where is my bicycle?”
  ——gone，____been stolen！
  4. Here is my dog. ____ name is Tom .Key: 1. its 2. It’s 3. It’s it’ s 4. Its
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