the helper print the card with the date by that 这句感觉print应该改成prints三单现的时态,或者过去式printed,但是如果是图书馆说明,改成三单现更好
the book must be returned to the library.这句找不到错误
If the book has BEEN returned late,the person must pay money FOR having broken the rule
只改了两处明显错误,用大写字母标注出来了,第一个加BEEN是因为应该是被动,书被还,第二个改成FOR 是因为应该是PAY MONEY FOR DOING STH,