Hans explained how it was that he was still alive.

Hans explained how it was that he was still alive.
句子成分是什么?

句子的骨干是个宾语从句.
主语：Hans
谓语：explained
宾语（从句）：how it was that he was still alive.
其中宾语从句又是一个强调句,还原回普通句为：how he was still alive,意思是,“他是怎样活下来的.”
再问： 看不懂这句强调句，强调句不是it is ..that 吗 从句改强调句怎么改？请指教
再答： 特殊疑问句改为强调句：疑问词如why+is/was it +that +其它，如果这个特殊疑问句要做宾语从句，那么只需把is/was和 it的位置调就行了，就像陈述语序一样。 【俊狼猎英】团队为您解答。请尽快采纳。
再问： 特殊疑问句改为强调句：疑问词如why+is/was it +that +其它，如果这个特殊疑问句要做宾语从句，那么只需把is/was和 it的位置调就行了，就像陈述语序一样 你是说，这个特殊疑问句不改为强调句作宾语从句时（即单纯的特殊疑问句做宾语从句），只需把is/was和 it的位置调就行了，吗？
再答： 单纯的特殊疑问句做宾语从句，根本没有it is/was...that结构，又何来把is/was和 it的位置对调呢？只需按照下面的语序：特殊疑问词（或者连同被它修饰的成分）+主语+谓语就行了。如：Hans explained how he was still alive. 【俊狼猎英】团队为您解答。
再问： how was he still alive-----how was it that he was still alive 特殊疑问句----特殊疑问句的强调句 how was it that he was still alive的特殊疑问句的形式是这样的吗how was he still alive
再答： 完全正确！ 本题解答到此为止，请即采纳！ 【俊狼猎英】团队为您解答。请尽快采纳。
再问： how was he still alive-----how was it that he was still alive 特殊疑问句----特殊疑问句的强调句 为什么不是how was it that was he still alive?
再答： 本题不再解答。如再有疑问，请另外提问。 【俊狼猎英】团队为您解答。
再问： 问题是我还没完全懂，为什么不教懂我吧，帮人帮到底。 how was he still alive-----how was it that he was still alive 特殊疑问句----特殊疑问句的强调句 为什么不是how was it that was he still alive? 特殊疑问句：how are your roommate's request and yours identical ? 表强调的的特殊疑问句：how is it that your roommate's request and yours are identical? 这句是这样的吗
再答： 先采纳吧！