Write a letter to the department to ask for:.

问题描述:

Write a letter to the department to ask for:.
请指出以上句子的结构成分.主谓宾等分别是哪些.谢谢.

什么意思?
祈使句.
ask/request/tell/order sb(not)to do sth是常用结构.
此句省略主语.
谓语是writer,宾语是letter.原来是省略了主语 我说我找不到主语是那个 谢谢呀