1. 你今天不能读书。
2. 因为否定词"can't"表示不可能或不允许，所以"you can read books today."的否定句就是"你今天不能读书。
"3. 如果你想表达其他否定的方式，可以使用其他否定词如"shouldn't"或"mustn't"等，例如"you shouldn't read books today."或"you mustn't read books today."。
you can read books today.的否定句
这句英文的否定句是
You can't read books today.
你今天不能读书。