When their father died,they thought it their duty to keep Er

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When their father died,they thought it their duty to keep Eric in hiding.这里面为什么要...
When their father died,they thought it their duty to keep Eric in hiding.这里面为什么要加it?

it是形式宾语啊,真正的宾语是后面的动词不定式.
其实it后面省略了to be,加上了之后是不是好理解了呢,你可以把句子还原成这样：they thougut it to be their duty to keep eric in hiding.或者they thought to keep eric in hiding to be their duty.
怎么样,理解了吧,

When their father died,they thought it their duty to keep Er They regard__________as their duty to provide the best servi A man and his wife had a dog to keep their house．When they w they‘er going to Shanghai with their teacher对with their taec when they have made their list,they read it to t 首字母填空：they thought they had tombs strong e_____to keep their they keep their secrets to themselves为什么用介词“to” They must keep their clothes______. They worked hard to ___________for their large family a.keep Then when the food is r___,they take it to their tables by t They feel ___ their duty to be kind and helpful to others请问这 They think _____their duty to be loyal to their country?A,th