It's obvious that they can not only help us to know the world better but also can open our minds and widen our horizon.
问题描述：
It's obvious that they can not only help us to know the world better but also can open our minds and widen our horizon.
请问这句话有错吗?我有点不确定can用不用啊
答
not only ...but also ...是一个固定搭配,后面要对称.所以but also后面就不要用can了.那如果改成they not only canhelp us to know the world better but also can open our minds and widen our horizon.这样可以吗，后面的can还要不要用？额，有点累赘啊，改成那样的话，用不用can都行。不过，个人感觉下面的表述更好：They can not only help us to know the world better but also open our minds and widen our horizon.