---is it---has made tom---he is today.

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---is it---has made tom---he is today.

---is it---has made tom---he is today.
---is it---has made tom---he is today.

---is it---has made tom---he is today.
是什么使Tom变成现在这个样子.
it is that 强调句型,在这里强调what,“什么”,强调句型在句中不做成分,可以不看它,这样句子就变成了:what has made Tom what he is now.
然后 第一个 what 做主语 has made 是谓语 Tom 是宾语
what he is now 是从句做宾补,在这里what做系动词is的宾语,主语是he,now 是时间状语.