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1、现在完成时态三现在完成时态三现在完成时态三现在完成时现在完成时forfor和和sincesince延续性和非延续性动词延续性和非延续性动词 for 用于现在完成时态的时候，后面要与一段时间连用，表示动作延续时间的长度.I have had my schoolbag for four months.He has studied here for two years.We have had English for 10 mins.Since“自从；从以来”一般用于现在完成时态，后面接一般过去时的时间或者动作；也可以接一段时间加上ago.I have had my schoolbag since f
2、our months ago.He has studied here since he moved here.We have had English since 8:30。时间段一段时间+ago过去的动作过去的时间注意：非延续动词不能与since和for搭配使用！I have borrowed this book for five years.I have kept this book for five years she has bought this sweater since 2017She has had/owned this sweater since 2017什么是非延续性动词和延续性动词？He has come to Beijing for two years.He has been in Beijing for two years 非延续性非延续性动词动词 延续性动词延续性动词 come be(in)buy have borrow keep leave be away die be dead stop be over begin/start be on open -be open close -be closed 延续性动词表示经验、经历，而非延续性动词表示行为的结果，不能与表示一段时间的状语连用【注意】现在完成时态当中非延续性动词与延续性动词的转变