修改病句英语的my brother bought aumbrella.there is cloud in the sky.how many a apple are there?my brother bought aumbrella.there is cloud in the sky.how many a apple are there?my brother bought a umbrella.不用了

三题都是单复数问题的改错：

my brother bought (an) umbrella. umbrella是元音开头的发音，前面要加an
there is cloud in the sky. 因为cloud可以可数也可以不可数，这句看似没有问题，实在要改就把is改成are
how many (apples) are there? apple改成复数和后面are一致，且题目也问是多少只苹果，一般讲到多少只就不大会是一只

希望我的回答能帮到你，望采纳！

there is no cloud in the sky.
how many apples are there?

第一句是冠词使用错了.umbrella雨伞,一把雨伞,冠词应该用an,所以这句改为：
My brother bought an umbrella.
第二个句子是缺少冠词,there is 单数句,cloud 前面应该加a.所以这句改为：
There is a cloud in the sky.
第三个句子是多了冠词,How many是问多少个,应该用名词复数,不能用a,所以这句改为：
How many apples are there?
理解请采纳,不明白可再问,

there are clouds in the sky 或 there is a cloud in the sky 个人认为变复数比较好(cloud 可数名词，不能单独使用)
how many apples are there?(how many + 可数名词复数)