帮我看看下面这段话有什么语法错误或者其它不好的,很短的
The day before that day,my mom,cousin and I went to a flower shop to by some flowers.one rose is 4 yuan,we bought 30 roses.
Next day morning,my cousin and I were ready for selling flowers to sweeties.we didn’t know how many they would buy,but we had confdence.
There were a lot of people on the street.most of them were sweeties.first,we helped the flowers to dressed.we put some pieces colorful paper on the branches.as far as I know,we should cut the withered petals.that made the roses more beautiful.