This is generally because they have not had to work for thei

This is generally because they have not had to work for their money
generally的位置没问题,副词的位置很灵活,放在句前、句中、句末都行
It is very common for teens to not understand the value of money
not应该放在to前面
It is very common for teens 【not to】 understand the value of money