现在完成时(二)&&。。。+过去时间点(一过)for+时间段(现完)since+过去时间点(现完)since+时间段+agosince+ ?’:A:Howlonghashe/she…?B:He/Shehas…for/since….aquarter15years30years20minuteshalfanhourhalfanhour5短暂性动词:延续性动词:。。:不能与时间段连用延续性动词:e/goleavebeginfinish/endjoindieopenclosemarry不与时间段连用可与时间段连用be(in)here/therebeamemberofbedeadbeonhavebeawaykeepbeoverbeopen(adj.)beclosedbemarried81.—HowlongcanI____thisbook?—,,,
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