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1.assoonas…一…就…=directly/immediately/instantly…

=thesecond/theminute/themoment/theinstant…

Eg.Hecamearoundtoseemeassoonas/themoment/immediatelyhecheckedinthehotel.

他刚一入住宾馆就来看我.

Theyinformedusthenewsimmediately/directlytheygotit.

他们一得到消息就通知了我们.

Thepolicemancametothespotthemoment/theinstant/theminutesheheardoftheaccident.一听说事故，这位警察就到了现场.

2.….before….

(1).没来得及…就…

Therooffellbeforehehadtimetodashintotheroomtosavehisbaby.

他还没有来得及冲进房间把孩子就出来，房顶就塌了.

HeranoffbeforeIcouldstophim.

Tomygreatdisappointment，myfavoritesingerlefttheconcertbeforeIcouldhaveawordwithhim.

(2).过了多久才怎么样，动作进行到什么程度才怎样

Theywalkedaboutthirtymilestothewestbeforetheysawavillage.

Theyworkeddayandnightaboutthreedaysbeforeeverythingreturnedtonormal.

ThreeyearspassedbeforeIknewit.

3.Itwas+时间段+before….过了多久才….;

Itwasnotlongbefore…不久就…

Itwill(not)be+时间段+before…要过多久(不久)…..才…..

Eg.Itwasnotlongbeforehesensedthedangeroftheposition.

Itwasthreeyearsbeforehecameback.

Itwillbehalfayearbeforeyougraduatefromthisschool.

4.nosooner…than…=hardly…when…一…就….，刚刚…就…

Nosooner/hardly+过去完成时，than/when+一般过去时

如果nosooner，hardly位于句首，主句要倒装.

HehadhardlysatdowntohavearestwhenthedoorbellrangandincameAllan.

Nosoonerhadhegotoffthetrainthanhisdaughterrantowardshim.

Hardlyhadwearrivedwhenshestartedcryingtogohome.

5.once一旦….，表示时间和条件

Onceyouunderstandthisrule，youwillhavenofurtherdifficulty.

Onceyouhavedecidedtodosomething，youshoulddoitwell.

Onceyouenterthechemistrylab，youshouldfollowtheteacher’sinstructions.

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