频度副词 列如1.sometimes常可用于句首.如：Sometimes she comes late.有时她来得晚.Sometimes she didn’t agree with me.有时她和我意见不一致.Sometimes we get a lot of rain in August.有时在8月份雨水很大.2.often用于句首时,通常表示强调,且其前一般有quite,very修饰.如：Very often he comes in late.他常常迟到.Quite often the phone rings when I’m in the bath.电话经常在我洗澡时响.3.usually有时也用于句首,其前不用修饰语.如：Usually I get up early.我平时起得早.Sometimes he comes by bus,but usually he comes by taxi.有时他坐公共汽车来,不过他通常还是打的来.Usually cooking pots have two small handles but pans have one long handle.通常地深底煮锅有两只把手而平底锅只有一个长长的把手.4.always一般不用于句首,除非是用在祈使句中.如：Always remember this.请时刻记住这一点.Always look in the mirror before starting to drive.一定要先看看反光镜再开车.另外,never也可用于祈使句的句首.如(from
www.yygrammar.com)：Never tell him the news.千万不要告诉他这消息.Never ask her about her marriage.决不要问她结婚的事.5.在正式文体中,表示否定意义的副词seldom,never可位于句首,但此时其后要用倒装语序.如：Seldom has there been such a happy meeting.过去很少有过这样愉快的会议.Never did he think the book would be finished so soon.他可没想到这本书会这么快看完