帮忙讲解一句英语Itdonottellhowableanunderprivilegedyoungstermighthavebeenhadhegrownupundermorefavorablecircumstances.请帮我分析下这句英语的句型

Question

帮忙讲解一句英语
It do not tell how able an underprivileged youngster might have been had he grown up under more favorable circumstances.
请帮我分析下这句英语的句型

Answer 1

原句等于;
It do not tell how able an underprivilleged youngster might have been if he had grown up under more favotable circumstances.
宾语从句是虚拟语气
它（文章）没有讲一个社会地位底下的人,如果在比较有利的环境下长大的话,他会有多强的能力