1.一般現(xiàn)在時(shí)與現(xiàn)在進(jìn)行時(shí)概述
     2. 頻度副詞
     課文里多次出現(xiàn)了說明動(dòng)作發(fā)生頻率的副詞， 如：never, sometimes, always。
     I never get up early on Sundays.
     I sometimes stay in bed until lunchtime.
     Do you always get up so late?
     如何準(zhǔn)確使用頻度副詞
     名詞或詞組動(dòng)作發(fā)生頻繁程度如下：
     100% all the time 90% almost, always 80% generally, usually
     60-70% often， frequently 40-50% as often as not 20-30% sometimes， at times
     10% occasionally， from time to time 5% rarely, hardly, ever, seldom
     0% never
     對(duì)頻度副詞進(jìn)行提問時(shí)，要用how often。
     How often do you do the laundry a week?
     How often does Jimmy go to the gym?
     辨析： sometimes，some times，some time，sometime
     I sometimes stay in bed until lunch time. 有時(shí)
     I have overslept some times.　有幾次
     We can grab something to drink sometime next week. 　某時(shí)
     I had known Ken for quite some time before dating him.一段時(shí)間