request for sth与ask for sth有什么区别

request for sth与ask for sth有什么区别 ask sb sth 是双宾,那到底是改成ask sth for sb 还是ask sb for sth 有什么区别 ask sb to do sth和ask sb for sth有什么区别? prepare for sth与prepare sth有什么区别? prepare sth 与 prepare for sth 有什么区别 ask for 和 ask sb to do sth 有什么区别 request和ask for有什么区别?并举例说明 ask sth for/to? search sth和search for sth有什么区别 pay sth.和 pay for sth.有什么区别 use sth to do sth和use sth for dong sth有什么区别 check for sth 与check sth区别,prepear for sth与prepear for sth区别