请问英语中的对某人来说 for sb在句中做什么成分比如

在你给的例子中It was exciting for me to visit the Great Wall for the first time

其中It是“形式主语”，for to 结构是真正的主语；可以说对于it和 for to结构表示同一事物时，it在句子是什么成分，for to 就是什么成分

下面是一些网上的例子，你看看
for sb to do sth结构为for加名词或代词宾格再加不定式构成的复合结构,它在句子中可以用作以下句子成分：　　一、用作主语.如：　　for sb to do sth结构在句子中可以用作主语.如：　　For you to ask Joe would be a big mistake.你要是去问乔,那将是一大错误.　　For Ann to go to France would make me very happy.安要是到法国去将使我感到很高兴.　　二、用作表语.如：　　for sb to do sth结构有时可用作表语.如：　　It is for you to decide.该由你来决定.　　His idea is for us to travel in separate cars.他的意思是我们不要同乘一辆汽车.　　There’s a plan for Jack to spend a year in Japan.有一个计划是让杰克在日本呆上一年.　　三、用作宾语.如：　　for sb to do sth结构有时也可用作某些动词的宾语.如：　　She hates for people to feel sad.她不愿看到人们忧心忡忡.　　I thought it strange for her to be out so late.她这么晚还不回来,我觉得有些奇怪.　　I would like for you to stay as long as you want.我希望你留下来,想留多久就留多久.　　四、用作定语.如：　　for sb to do sth结构用可以作定语.如：　　It’s time for everybody to go to bed.是大家睡觉的时候了.　　He raised his arm as a signal for us to stop.他抬起手臂示意我们停下.　　五、用作状语.如：　　for sb to do sth结构可以用作状语.如()：　　We were all shouting for him to shoot.我们都喊着要他射门.（表目的）　　This is much too heavy for you to lift.这东西太重,你拿不起来.（表结果）　　How would it do for me to write to him?我来给他写信如何?（表条件）

定语