这3个英文句子有用哪些语法?是什么结构?比如that 和 to等等.

题目

这3个英文句子有用哪些语法?是什么结构?比如that 和 to等等.
1.when children grow up,they are expected to live in the same area as their parents,to marry people that their parents know and approve of,and often to continue the family occupation.
2.often,however,the ambitions that parents have for their children are another cause of the division between them.
3.Finally,the speed at which changes take place in our society is another cause of the generation gap.

答案

1.when引导的时间状语从句
to live,to marry,to continue 三个动词不定式做expected 的主语补足语
2.that 引导的定语从句,修饰the ambitions
3.at which引导的定语从句,修饰the speed