愛(ài)華網(wǎng)1.at，on，in
a）at用來(lái)表示時(shí)間時(shí)，通常指時(shí)間的某一點(diǎn)。例如：atfiveo’clock，atnoon，atmidnight.
b）on用來(lái)表示某一段時(shí)間，特指某天或某天的上午、下午或晚上。例如：onSunday,onSaturdaymorning.
c）in也可用來(lái)表示一段時(shí)間，但多指長(zhǎng)于一天或不到一天的時(shí)間段。例如：inJanuary,insummer,in1988,inthemorning,intheevening.
2.in與during
a）during用來(lái)表示一段時(shí)間，其意義大致相當(dāng)于in的用法。一般來(lái)說(shuō)，凡是能用in的地方，也可以用during.例如：Hecametoseemeduringmyabsence.
Don’tgotoseehiswifeinhisabsence.
b）during與in的區(qū)別在于during強(qiáng)調(diào)時(shí)間的延續(xù)性，而in則只是一般指某一時(shí)間。試比較：TheyvisitedmanycitiesduringtheirstayinChina.Hergrandpawaskilledinthewar.
3.in,for,during
a）“in＋時(shí)間”與“for＋時(shí)間”都可表示一段時(shí)間，但“for＋時(shí)間”表示“有多久”，而“in＋時(shí)間”則表示“在何時(shí)”。例如：Weworkedthereforthewinter.Theyworkedthereinwinter.
以上兩例中，inwinter強(qiáng)調(diào)“在冬季”，不一定包括整個(gè)冬季時(shí)間，而forthewinter則強(qiáng)調(diào)“整個(gè)冬天”。
b）for用來(lái)表示一般時(shí)間，常跟具體的時(shí)間段。例如forafewdays,for3weeks,forfivemonths等
4.since與aftersince與after
都可以用來(lái)引導(dǎo)表示從過(guò)去某一點(diǎn)開(kāi)始的時(shí)間段詞組。它們的不同之處在于：
a）since引導(dǎo)的詞組所表示的時(shí)間一直延續(xù)到說(shuō)話(huà)時(shí)為止，因而要與現(xiàn)在完成時(shí)連用。例如：Hehasbeentheretwicesince1982.Ihavedonenothingsincesixo’clock.
b）after引導(dǎo)的詞組所表示的時(shí)間是純系過(guò)去，并不延續(xù)到說(shuō)話(huà)時(shí)，因此要和一般過(guò)去時(shí)連用。例如：Hewenthomeafterschool.
5.till,until與to
a）介詞till／until常用于“from.……till／until”結(jié)構(gòu)中，表示“一個(gè)動(dòng)作的終結(jié)”。介詞to常用在“from.……to”的結(jié)構(gòu)中，用來(lái)表示“一個(gè)階段的終結(jié)”。兩者在這種結(jié)構(gòu)中意義十分接近。例如：TheAmericansstayedherefromJunetoSeptember.Hestudiesfrommorningtill／untilnighteveryday.
b）to可用在表示鐘點(diǎn)的詞前。我們說(shuō)It’ssixtofive.但不能說(shuō)It’ssixtill／untilfive.反之在某些能用till／until的場(chǎng)合，卻不能用to.例如：在“not.……until”結(jié)構(gòu)中，我們說(shuō)Ididn’tgotobedtill／untilteno’clock.卻不能說(shuō)Ididn’tgotobedtoteno’clock.
c）till與until也有細(xì)微區(qū)別。till常用在非正式文體或口語(yǔ)中，而until則常用于正式文體及比較正式的場(chǎng)合。另外，在句首多用until.
6.by與before
a）by表示時(shí)間時(shí)，意思是“到……以前”、“不遲于”、“到……時(shí)（為止）”。例如：bysuppertime，bytheendoflastterm
b）before表示時(shí)間，意為“在……以前”。例如：beforeliberation，thedaybeforeyesterday
c）by與before的區(qū)別在于，by短語(yǔ)表示時(shí)間，強(qiáng)調(diào)“終止點(diǎn)”，而before短語(yǔ)表示時(shí)間，強(qiáng)調(diào)“起始點(diǎn)”。例如：Yoursonwillbeallrightbysuppertime.
句中的bysuppertime表示從說(shuō)話(huà)時(shí)到晚飯前這段時(shí)間。而before構(gòu)成短語(yǔ)則表示從某一時(shí)間或事件之前，例如：Thepoorchildrencouldn’tgotoschoolbeforeliberation.
強(qiáng)化練習(xí)：
()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____1996.
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___9:30___March5.
A.at;in;atB.to;on;atC.in;on;atD.in;at;on
()20.TheEnglishteachertoldmetogetthere____halfpastten.
A:inB.atC.onD.of
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