表示时间的介词和频度副词

第页时间介词(at,in,on)的用法at（1）时间的一点、时刻等。如：Theycamehomeatseveno’clock.(atnight,atnoon,atmidnight,atteno’clock,atdaybreak,atdawn）.（2）后面接表示岁数的词。ChildreninChinastartschoolat6yearsold.（3）较短暂的一段时间。可指某个节日或被认为是一年中标志大事的日子。如：HewenthomeatChristmas（atNewYear,attheSpringFestival）.2.in（1）在某个较长的时间（如世纪、朝代、年、月、季节以及泛指的上午、下午或傍晚等）内。如：in2019,inMarch,inspring,inthemorning,intheevening,etc（2）在一段时间之后,常用于将来时。Hewillarriveintwohours.Theseproductswillbeproducedinamonth.3.on（1）具体的时日和一个特定的时间，如某日、某节日、星期几等。如：OnChristmasDay（OnMay4th）,therewillbeacelebration.（2）在某个特定的早晨、下午或晚上。如：Hearrivedat10o’clockonthenightofthe5th.（3）准时，按时。如：Ifthetrainshouldbeontime,Ishouldreachhomebeforedark.表示频率的副词用法详解一、常见的频率副词always，usually，often，sometimes，seldom，never.1)always表示的频率为100%，意思是"总是、一直、始终"。IalwaysdomycleaningonSundays.我总是在星期天搞卫生。2）usually与always相比，表示的频率要低些，约为70%-80%。意思是"通常"。Plantsareusuallygreen.植物通常是绿色的。Usuallyshegoestoworkbybus.她通常乘公共汽车去上班。

3）often的频率比usually又略低些，约为60%-70%，意思是"经常"、"常常"。Doyouoftenwritetothem?你常给他们写信吗？

DoesFredcomehereoften?弗雷德常来这儿吗？

4）sometimes的频率比often又低些，约为50%＞sometimes＞30%，意思是“有时、不时”。Jennyusuallyeatsasandwichforlunch.Sometimessheeatssoup.5）seldom的频率比sometimes还要低些约为20%左右，意思是“很少”。MyfatherwasseldomathomeonSundays.我父亲星期天很少在家。6）never与always完全相反，是100%否定，意思是“从不，决不，总是不“。Icanneverstop.我绝不会停止。LiMingneverwearsdresses.李明从不穿裙子。Iwouldneverdoanythingtohurthim.我绝不会做任何伤害他的事情。二、频率副词示意图alwaysalwaysneverusuallyoftensometimesseldom0三、频率副词在句中的位置通常频率副词放在行为动词之前，be动词，情态动词或助动词之后。但是sometimes最活跃。它既可以在句中也可以在句首，还能在句末。其它词如often也可以放在句中也可以放在句末，这里就不一一列举了。四、注意的问题always的完全否定形式是never,部分否定形式是notalways.例如：Shealwayswearsadress.她总穿裙子。(改否定句)1）Sheneverwearsadress.她从不穿裙子。(彻底否定)2）Shedoesnotalwayswearadress.她不总穿裙子。（部分否定）有如：Thericharenotalwayshappy.富有未必是幸福的。时间介词用法练习：()1.Childrengetgifts____Christmasand____theirbirthdays.A.on;onB.at;onC.in;inD.in;on()2.Thereisnothing____tomorrowafternoon,isthere?No.Wecanhaveagameoftabletennis.A.onB.inC.outD.up()3.Alotofstudentsinourschoolwereborn____March,1981.A.inB.atC.onD.since()4.Hesuddenlyreturned____arainynight.A.onB.atC.inD.during()5.Mygrandfatherwasborn____Oct.10,1935.A.onB.inC.atD.of()6.Thetrainisstarting___fiveminutes.A.inB.atC.forD.still()7.Mikedoeshisexercises____seven_____theevening.A.on;toB.at;inC.by;ofD.at;on()8.Childrenwakeupveryearly____themorningofChristmasDay.A.inB.onC.forD.at()9____acoldwintermorning,Imetherinthestfeet.A.InB.OnC.AtD.For()10Ithappenedtobeverycold____themorningofoursportsmeeting.A.atB.onC.withD.of()11.Whydidyougetupsoearly___thismorning.A.onB./C.atD.in()12.HewenttoShanghai___September3,1991andcameback___acoldmorninglastyear.A.in;onB.on;inC.on;onD.in;ia()13.Lucywasborn____thenightofMay12,1984.....A.onB.inC.atD.to()14.MrsBrowncametoChina____2019.A.onB.ofC.to,D.in()15___themorningofNovember20,1915,theworkerscametoChicagotoshowtheirmourningofJoeHill.A.OnB.InC.OnD.At()16.Annmoved___Hangzhou___September,1992.A./;inB.to;inC.to;onD,in;in()17.Theystartedoff___anautumnafternoon.A.duringB.atC.inD.on()18.Heoftengoes____school____sixthirty____themorning.A.for;to;inB.to;at;inC.to;for;atD,for;at;to()19.Hearrived___Shanghai_