The ability to solve problems is not easy for children to learn

问题描述:

The ability to solve problems is not easy for children to learn
The ability 作主语 to solve problems 作The ability 的定语
is(not) 系动词+easy 表语=谓语
For 介词+children介词宾语=状语
to learn 是目的状语,而不是与easy一起作表语

可以这么理解.