1) 如果后接名词时, much more +不可数名词
many more +可数名词复数
2) old 有两种比较级和最高级形式: older/oldest 和elder/eldest。 elder,eldest 只用于兄弟姐妹的长幼关系。
My elder brother is an engineer.
Mary is the eldest of the three sisters.
3) far 有两种比较级,farther,further. 在英语中两者都可指距离。
在美语中,father 表示距离,further表示进一步。
I have nothing further to say.