be necessary for的用法1.I can't decide which to buy.这里可不可以用what to 2.be necessary for和be necessary to的区别?

be necessary for的用法1.I can't decide which to buy.这里可不可以用what to 2.be necessary for和be necessary to的区别? be necessary for和 be necessary to的区别老师说be important to后面加人,如果还有下文用be important for sb doing sth那be necessary to 和be necessary是不是也是这种用法?还是说be necessary to do sth be necessary for doing st be necessary for sb./sth的反义词说是什么? be necessary for和be necessary to 有何区别 be good for 的用法? important 和 necessary 的用法是什么啊?关于 to 和 for的 Old age has always been thought of as the worst age to be; but it is not 接下条necessary for the old to be unhappy.然后分析一下AS的用法, be good for加not的用法 be famous for的用法,造句 be busy for的意思和用法 be late for的用法如上 be famous for的用法造句 能不能解释英语句It is necessary that be sent there at once.中BE的用法. should和necessary的区别?以及用法? 英语高手速进! necessary 的用法! be late for用法 be ready for 用法 be necessary