分析语法结构I am writing the letter in purpose of applying for your recently advertised position for a staff member 我知道主是I 、am writing 是谓 宾语是 the letter 请问后面的句子怎么分析
问题描述：
分析语法结构
I am writing the letter in purpose of applying for your recently advertised position for a staff member
我知道主是I 、am writing 是谓 宾语是 the letter 请问后面的句子怎么分析
答