帮忙一半完成时和过去完成时.1.(after)shewrotetheletter.shewenttothepostoffice.
2.(after)hehaddinner.herwenttothecinema.
3.(when)ifastenedmybelt.theplanetookoff.
4.wedidnotdisturbhimwntid.hefinishedwork.
5.(assoonas)helefttheroom.iturnedontheradio.