A crow is thirsty .He finds a bottle with a little water in it .But the neck of the bottle is to

A crow is thirsty .He finds a bottle with a little water in it .But the neck of the bottle is to
o long ,the crow can’t get water .The crow thinks and thinks ,and then he has a good idea .He puts some pebbles in the bottle .The water rises up .Now he can drink the water .What a clever crow Tt was clever crow.这句话对吗,我总觉得语法有错误
那个was好像用得有问题