新概念英语第二册59课语法问题
Ourdog,Rex,usedtosit
outsideourfrontgateandbark.Everytimehewantedtocomeintothegardenhe
wouldbarkuntilsomeoneopenedthe
gate.Astheneighbourscomplainedofthenoise,myhusbandspentweekstraining
himtopresshispawonthelatchtolethimselfin.Rex
soonbecameanexpertatopeningthegate.However,whenIwasgoingout
shoppinglastweek,Inoticedhiminthegardennearthegate.Thistimehewas
barkingsothatsomeonewouldlethimout!Sincethen,hehasdevelopedanother
badhabit.
Assoonasheopensthe
gatefromtheoutside,hecomesintothegardenandwaitsuntilthegateshuts.
Thenhesitsandbarksuntilsomeoneletshimout.Afterthisheimmediatelyletshimself
inandbeginsbarkingagain.YesterdaymyhusbandremovedthegateandRexgot
soannoyedwehavenotseenhim
since.
从Assoonasheopens开始后面都使用的是一般进行时,可是这篇课文不是在描述以前发生的事情吗?为什么用一般现在时?