I will ask someone to post the letters for 改同义句

问题描述:

I will ask someone to post the letters for 改同义句

I will have the letters posted.
have sth done 叫别人完成某事

I will ask someone to post the letters for you.--------“主语,谓语,宾语和宾语补足语”结构
== I will have the letter posted for you.------- have sth done------“使役动词”结构