高中英语 Unit1Tales of the unexplained Grammar and usage 1精品课件 牛津译林版必修2 课件.ppt

Grammarandusage
PresentperfecttenseThedisappearanceofJustin_______(make)Kellyveryunhappy.

·I___________(notsee)JustinsincelastFridaynight.
3.Weusethepresentperfecttensewhentheexacttimeofanactionisnotclearorimportant.Weuseitwithtimeexpressionssuchas:
alreadyeverforjustlatelynever
recentlysinceyet
Exercise:completethefollowingsentenceswiththe
propertense:
(1)We____________(study)Englishforaboutfive
years.
(2)They__________(live)inthesouthsincetheir
daughterwasborn.
(3)I__________(read)yourarticlethreetimes.It’s
wellwritten.
(4)Thestudent______________(finish)her
homeworkalready.
(5)Eric_____just_____(go)backtohishometown.
Weusealreadyforaffirmativestatementsandyetfornegativestatements.
Weusefor+aperiodoftimeandsince+apointintime.
4.Weusethepresentperfecttensetotalkaboutactionsthatwerecompletedonlyashorttimeago.5.Wecanalsousethepresentperfecttenseforrepeatedactions,thatis,weusethepresentperfecttensewiththetimeexpressionsonce/twice/threetimes…

6.Form:have/has+thepastparticipleoftheverb
Step3Readthediaryentryandthencompleteitusingthecorrectformsoftheverbsinbrackets.Presentperfectcontinuoustense2.Weusethepresentperfectcontinuoustensetotalkaboutactionsthatstartedinthepastandarestillcontinuing.
IhavenotbeensleepingwellsinceIreturnedhome.

Past_____________________________________
Present
3.Wealsousethepresentperfectcontinuoustensetotalkaboutactionsthathavejustfinishedbutarestillconnectedtothepresentinsomeway.
Kelly:SorryI’mlate.Haveyoubeenwaitinglong?
Mavis:Yes.I’vebeenwaitingforanhour.

havebeenobservingPrepareGrammarandusage.
2.FinishPartC1andC2inWorkbook.