现在完成时通常使用现在完成时几个情况：Completethefollowingsentenceswiththepropertense.现在完成时与普通过去时区分：完成以下句子：I_______(see)thisfilmyesterday.（强调看动作发生过了）I____________(see)thisfilm.（强调对现在影响，电影内容已经知道了）He__________(be)intheLeagueforthreeyears.（在团内状态可延续）He________(join)theLeaguethreeyearsago.（强调加入动作发生在过去）普通过去时还是现在完成时？现在完成时与普通过去时惯用时间状语：延续性与非延续性动词：注意：非延续性动词否定形式能够与表示延续时间状语连用。即动作不发生状态是能够连续。判断正误：（）Ihavereceivedhisletterforamonth.（）Ireceivedthisletteramonthago.（）Ihaven'treceivedhisletterforalmostamonth.比较since和for：Since用来说明动作起始时间，for用来说明动作延续时间长度。比如：Ihavelivedhereformorethantwentyyears.IhavelivedheresinceIwasborn.注意：并非有for时间状语句子都用现在完成时。比较：I______(work)hereformorethantwentyyears.（我现在已不在这里工作。）I___________(work)hereformanyyears.（现在我仍在这里工作。）注意：用句型转换方法，很轻易排除非延续动词在有for/since结构完成时中误用。1）（）TomhasstudiedRussianforthreeyears.=TombegantostudyRussianthreeyearsago,andisstillstudyingitnow.2）（）Harryhasgotmarriedforsixyears.=Harrybegantogetmarriedsixyearsago,andisstillgettingmarriednow.第二句应改为Harrygotmarriedsixyearsago.或Harryhasbeenmarriedforsixyears.用于现在完成时特殊句型1）Itisthefirst/secondtime....that…结构中从句部分，用现在完成时。比如：ItisthefirsttimethatI_________(visit)thecity.Thisisthefirsttime（that）I_________(hear)himsing.注意：Itwasthethirdtimethattheboy_______(be)late.2）Thisis+形容词最高级+that…结构，that从句要用现在完成时。比如：ThisisthebestfilmthatI_____ever______(see).经典例题（1）---Doyouknowourtownatall?---No,thisisthefirsttimeI___here.A.wasB.havebeenC.cameD.amcoming（2）---Haveyou____beentoourtownbefore?---No,it'sthefirsttimeI___here.A.even,comeB.even,havecomeC.ever,comeD.ever,havecome现在完成时在时间或条件状语从句中使用方法：ReadthediaryentryonPage8andcompleteitusingthecorrectformsoftheverbsinbrackets.现在完成进行时(Presentperfectcontinuoustense):（朗诵以下两个句子，说说现在完成时两种使用方法）现在完成进行时表示某一动作在过去开始发生，已经连续到现在，而且还将连续；或刚才停顿，但与现在相关。1.IhavebeenlearningEnglishforthreeyears.2.Heisverytired,becausehehasbeencleaningtheroom.GooverthenewsstoryonPage2andfindthesentencesusingthepresentperfectcontinuoustense.Pleaseexplainwhythetenseisusedinthesesentences.Finishtheex