请问i'm good at swiming 中 AT SWIMING是作状语还是宾语 it's good for you中 for you 是作状语还是宾语

问题描述:

请问i'm good at swiming 中 AT SWIMING是作状语还是宾语 it's good for you中 for you 是作状语还是宾语
像双宾语中 GIVE STH TO SB 中TO SB又是什么成分 是作状语么 还是 单单是介词加间接宾语

SWIMING是AT的宾语,两者合称介宾短语.
it's good for you to do sth.中for you是介宾短语作状语,引出不定式(to do sth.)的逻辑主语.