1 I am sorry 是不是主系表结构 I am sorry to keep you waiting.句子中的to

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1 I am sorry 是不是主系表结构 I am sorry to keep you waiting.句子中的to keep you waiting做什么成分 2 The question is difficult to answer.句子中的to answer做什么成分.是不是有be动词出现都是主系表结构.
I am sorry 是主系表结构吗

I am sorry to keep you waiting
to keep you waiting 是不定式短语做状语,表原因
The question is difficult to answer
to answer 作状语修饰形容词difficult,和difficult一起构成形容词词组在句中作表语.此不定式和句子主语The question 有逻辑上的动宾关系
问题补充：
I am sorry 是主系表结构

1 I am sorry 是不是主系表结构 I am sorry to keep you waiting.句子中的to i am sorry to keep you waiting so long i am sorry to keep you waiting keep you waiting 后面能接动名词吗 I am sorry to keep you waiting for so longA I don't think so ----i am sorry to keep you waiting.----oh,not at all.i _____ I am sorry to keep you waiting for me for a long time i am sorry to keep you waiting for me so long 最佳答句是什么? i am sorry to have kept you waiting. I'm sorry to keep you waiting. I am sorry I _____(keep)you waiting so long. I am sorry to keep you_____ A.to wait B.waiting C.waiting fo I am sorry to you I am sorry foryou