最后来看下句2的谓语， 共有两个， 分别为begin 及 be widely thought ， 一主动一被动， 这又何尝不是增加句子灵活度的方式？

接下来进入到主体段2：

However, learning to understand and share the value system of a whole society cannot be achieved just in the home.（1） Once a child goes to school, they are entering a wider community where teachers and peers will have just as much influence as their parents do at home. （2）At school, children will experience working and living with people from a whole variety of backgrounds from the wider society. （3）This experience should teach them how to co-operate with each other and how to contribute to the life of their community.（4）

先来看本段的句1， 一方面双重否定表肯定了- not 及just用法。 再一方面还起到了承上启下的作用，起到对学校教育的论述。 句2， once及where引导两个从句做嵌套， 句子虽长， 但论述逻辑清晰。 段落的句尾再次出现平行结构， 也是为了和上段做呼应。

But to be a valuable member of any community is not like learning a simple skill. It is something that an individual goes on learning throughout life and it is the responsibility of every member of a society to take responsibility for helping the younger generation to become active and able members of that society.