I 是主语,know是谓语,后面是一个省略that的宾语从句,it是宾语从句里的形式主语,to learn another language是宾语从句里真正的主语,is 是宾语从句里的系动词,necessary是宾语从句里的表语.
I know it is necessary for you to learn another language句子成份
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---Is_______ necessary to learn another language?
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