高一必修二：Unit3reading知識點講解unit3computer學問點講解

原創人：北大附中河南分校王萍

1.ibeganasacalculatingmachineinfrancein1642.

translate：__________________________________________________

現在分詞作定語可以表示修飾詞的性質，特征?，F在分詞通常表示主動意思

translate:excitingnews________arunningman__________

thetrainleavingatten__________

fallingleaves_______fallenleaves_________

asurprisinglook____________asurprisedlook___________

連接高考：

1the_____lookonherfacesuggestedthatshe______itbefore.

asurprising;wouldn’tknowbsuprising;hadn’tknow

csurprising;hadn’tknowdsurprised;shouldn’tknow

2acommunicativesatellite______asmuchas3.5tonswassentupintospacelastweek.

awighingbweighedctobeweigheddbeingweighed

3scientistshave______thattheworld’spopulationwilldoublebytheendofthiscentury.

anumberedbincludedccalculatedddesigned

2.idevelopedveryslowlyandittooknearlytwohundredyearsbeforeiwasbuiltasananalyticalmachinebycharlesbabbage.

before用于這類句型的結構有：

itdidn’ttake/waslongbefore------過了不久就-----

itwilltake/belongbefore------要過很久----

itwon’ttake/belongbefore------不久-----

translate：

itdidn’ttakelongbeforethefirewasundercontrol

itwillbefiveyearsbeforewemeetagain

選學：

this/itisthefirst/second…time+that從句。that從句一般用現在完成時，假如把前邊的is改為was，則that從句用過去完成時。如：

thisisthefirsttimeihavecomehere.

itwasthethirdtime(that)hehadmadethesamemistake.

itis/hasbeen+一段時間+since從句。since從句中用過去完成時。

itwastenyearssincewehadhadsuchawonderfultime.

beabouttodo…when…意為“即將……（這時）突然……”。如：

iwasabouttogooutwhenthetelephonerang.

be(was/were)+doing…when…意為“正在干……（這時）突然……”。

theywerereadingwhentomshoutedinpain.

hardlyhad…done…when…;nosoonerhad…done…than…

when和than從句里用一般過去時，表示