请问:be up for sb是何意?

请问:be up for sb是何意? 请问:friend可以和 with连用吗?be taken with sb是何意? shout for sb(何意 请问be useful for sb是不是短语 是be difficult to sb 还是be difficult for sb? 是be free to sb 还是be free for sb 请问i would be up for 两个句型‘～1.be important to sb./sth.2.build sb./sth.up请问, be sth for sb be vailable for sb. be true for sb. be down for sb 英文语法：be sorry toor sb?是be sorry to sb还是be sorry for sb? 是be up to sb to do还是doing? be up to sb’s be strict to sth.是什麽意思?be strict with sb.be strct in sth.它们个是何意? be fit for 请问 1.sth be fit for sb 和sb be fit for sth 哪个是错的 还是都可以用 2.fit的过去分词是? 是be against for sb/sth还是be against sb/sth?请陈述理由.