1: No one knows how long it will last. 2: were curious to find out what had happened.请问第一个句子里的疑问词how long在句中是作know的宾语吗?第二个句子里的疑问词what是作happen的主语吗?

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1: No one knows how long it will last. 2: were curious to find out what had happened.请问第一个句子里的疑问词how long在句中是作know的宾语吗?第二个句子里的疑问词what是作happen的主语吗?
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1: No one knows how long it will last. 2: were curious to find out what had happened.请问第一个句子里的疑问词how long在句中是作know的宾语吗?第二个句子里的疑问词what是作happen的主语吗?
1: No one knows how long it will last. 2: were curious to find out what had happened.
请问第一个句子里的疑问词how long在句中是作know的宾语吗?
第二个句子里的疑问词what是作happen的主语吗?

1: No one knows how long it will last. 2: were curious to find out what had happened.请问第一个句子里的疑问词how long在句中是作know的宾语吗?第二个句子里的疑问词what是作happen的主语吗?
第一句中how long引导的句子(how long it will last )整个做knows的宾语,并非仅疑问词how long在句中是作know的宾语.
第二句中what had happened这个从句做find out 的宾语,what 是从句中happen的主语,你的判断正确.

说的对

1. how long多长时间 不是宾语,而是时间状语,这里引导时间状语从句作为整个主句的宾语。
2. what是从句中happen的宾语,但是引导的从句是find out 的宾语。

第一个句子是一个宾语从句,由how引导,也就是说how long it will last这个从句做know的宾语。
第二个句子也是一样的道理,都是宾语从句。