求英语达人 帮看看有没有语法错误

题目

求英语达人 帮看看有没有语法错误
Once upon a time,a clever boy called Sima Guang.
One day,he played hide and seek with his friends in the yard.
There is a big water tank in the yard,a boy climb up the tree,above the tank.
Suddenly,The boy fell into the tank .
Sima Guang picked up a big rock,broke the water tank.
The water went out,the boy was saved!

答案

既然是过去式,那通篇就都得用过去式
所以第三句There is 改成 There was.,a boy climbed.
倒数第二句picked up a big rock 逗号之后不能直接跟一个broke,因为逗号之后句子就没主语了,可以把逗号改成picked up a big rock then broke.
最后一句虽然没语法错误,不过went out 改成 flew out好一点并且逗号去掉