英语短文改错（10处错）
20
One Saturdaymorning,Li Ming and his grandpa was feeding the bird in the cage.The bird wasunhappily though it had enough food and water.Li Ming did not know why.
The next morning,on their way to school,Li Ming saw some birds fly in the sky.Then he thoughtof the alone bird in the cage.He decided to persuade his grandpa set the birdfree.When he got to home,he talked to his grandpa.With his great delight,his grandpa agreed.
The bird was setfreely.Li Ming and Grandpa were all very happy to see the bird flying awayinto the sky.