he trys to find out for what the old man has done.这句话中what the old man has done是什么从句?

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he trys to find out for what the old man has done.这句话中what the old man has done是什么从句?
he trys to find out for what the old man has done.这句话中what the old man has done是什么从句?

he trys to find out for what the old man has done.这句话中what the old man has done是什么从句?
for what=why

宾语从句,做find out 的宾语。句中的for是多余的。

宾语从句,做he trys to find out for这个句子的宾语所以是宾语从句,主句里面缺什么就叫什么从句