第一个 括号里面的 是 on 的 宾语从句.
介词后面跟宾语,所以是宾语从句.
第二个 felt it our duty 中 的 it =括号里的内容.
it 是形式宾语,真正的宾语是 括号里面的内容,因为
真正的宾语太长,
用形式宾语代替,把真正的宾语 放在最后,
使句子结构更加合理.
关于句子成分This book gives me some idea on( how to make friends).
2个回答
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