难点：had he grown up under more favorable circumstances等于If he had grown up under more favorable circumstances.
语法：在虚拟语气条件句中从句谓语动词有were, had, should 等词，可将if 省略，把 were, had, should 移到主语之前，采取部分倒装。
how able the underprivileged youngster might have been 恢复正常语序就是 the underprivileged youngster might have been how able.
一个物质条件差的年轻人会怎样有才能。
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