Both you and he likes reading books.每句句子中都有一处错,请改正并说明理由.还有：mum often tells me don"t to stay up too late.

likes --like, both… and结构后面谓语用复数。
don"t ---not。tell sb. not to do sth.

likes错 用like，或者用enjoy比较顺吧
don't错 用not

Both you and he like reading books.
both 两者都 主语是复数
Mum often tells me not to stay up too late.
tell sb.not to do 告诉某人不要干什么,对不定式的否定直接在to 前面加 not

Both you and he likes(like) reading books.
mum often tells me don"t to (去掉to) stay up too late.