“I am late for the party”为什么用for

“I am late for the party”为什么用for Late For The Party 歌词 I am late for school we are late for the party.(用I替换we改写句子) i am one of the boys ____never late for school I am ready for the party.同义句转换:I __ ____ ___the party. I am sorry for being late i am late.please wait for me. I am always late for school i am sorry for ___ late.(be) I am having a party for I am hardly ever late for school.为什么I后面要加am?