英语语法常识I am happy to do sth中 To do sth 是主语补足语还是状语,还有,为什么有的句子中谓语是动词,有的动词前却加了个be动词.

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英语语法常识
I am happy to do sth中 To do sth 是主语补足语还是状语,还有,为什么有的句子中谓语是动词,有的动词前却加了个be动词.

作原因状语.是to do sth使我happy.
英语句子分五种,有实义动词作谓语的才叫谓语动词,像你说的这个句子be动词在句子中不叫谓语动词,叫系动词,构成的句子是主语（I）+系动词(am)+表语(happy)+状语（to do sth.）

to do sth 是前面句子的状语成分 表原因 to do sth 是主动形式而to be done 是中的done 和to 前面的形式主语构成动宾

英语语法常识I am happy to do sth中 To do sth 是主语补足语还是状语,还有,为什么有的句子中谓语是动词,有的动词前却加了个be动词. 英语语法12I am happy you are here 是什么从句 I am very happy to have you! I am very happy to work here I am happy to be with you I am happy to share with i am so happy to learn I am happy to be invited.why i am so happy to learn I am happy to have 、急 i am happy to join you I am happy to help you.I am ( ) ( )help you. i am very happy to have chance to be I am happy! I am so happy I am so happy. I am very happy I am happy.翻译