here's a sweater for you这句话哪里错了?

here's a sweater for you这句话哪里错了?
here's a sweater for you
这句话哪里错了?

here's a sweater for you这句话哪里错了?
没错.如果是句子的话,第一个字母大写.

没错啊！看不出来有什么错误， 除了首字母该大写以外。

应该是This is a sweater for you . 吧？

No error.

Nothing wrong!