专题复习--现在进行时一．意义：现在进行时是表示现在、说话瞬间或当前一直正在做着的动作.二．构成:be(am,is,are)+动词现在分词（-ing形式）三.动词的现在分词的构成：（1）一般在动词末尾直接加ing,read→reading;work→working（2）以不发音字母e结尾的动词，先去掉e,再加ing，如skate→skatingmake→makingdance→dancingwrite→writinghave→havingride→ridingcome→comingtype→typing（3）少数几个以ie结尾的动词要变ie为y,再加-ingdie→dyingtie→tyinglie→lying★（4）辅+元+辅结构，应双写末尾的辅音字母，再加ing,如：puttingrunningbeginningstoppingswimmingshoppingjoggingsittinggettingforgettinglettingdiggingplanningpreferring四、现在进行时的句型转换：肯定句：主语+be+现在分词V-ing(+其他)Eg1.I’mdoingmyhomeworknow.Eg2.Sheissingingatthemoment.Eg3.Theyareplayingcomputergamesnow.否定句：主语+be+not+动词-ing+其他.Eg1.I’mnotdoingmyhomeworknow.Eg2.Sheisn’tsingingatthemoment.Eg3.Theyaren’tplayingcomputergamesnow.一般疑问句：Be+主语+动词-ing+其他？Eg1.Areyoudoingyourhomeworknow?---Yes,Iam.---No,I’mnot.Eg2.Isshesingingatthemoment?---Yes,sheis.---No,sheisn’t.Eg3.Aretheyplayingcomputergamesnow?---Yes,theyare.---No,theyaren’t.特殊疑问句：特殊疑问词+be+主语+动词-ing+其他？Eg1.Whatareyoudoingnow?Eg2.Whoishetalkingto?Eg3.Wherearetheydancing?五、现在进行时的时间标志及用法：1）一般句中用到表示“在现在”的时间状语，如：now,rightnow,atthemoment或It’s+几点钟”句型，常判断用现在进行时。Eg:Let’sgofast.Mr.Wuiswaitingforusnow/rightnow/atthemoment.Eg.It’ssixo’clock.Thechildrenareplayingbasketball.(2)句中用到“Listen！”“Look!”“Keepquiet”“Don’tmakenoise!”等提示语时，表明说话间另一个动作正在进行，这时，句子也要用现在进行时。Eg:Keepquiet!Theteachersaretalkingintheoffice.Eg.Look!Theyareplayingbasketballontheplayground.Eg.Don’tmakenoise!Thebabyissleeping.Eg.Listen!Sheissingingintheroom.(3)现在进行时常用来表示在当前一直做着的动词，这时句中常用thesedays,allthetime等时间状语。Eg:Thesedays,uncleWangisbuildingasmallroomforhisdog.Eg.Conditionsarechangingallthetime.(4)通过上下文句义，表明某一动作是现在或说话瞬间发生的动作，这个句子也要用现在进行时态。Eg:---Isyourmotherathome?---Yes,sheis.sheiswatchingTV.Eg.---WhereisTom?---Heisrunningontheplayground.(5)表示状态和感觉的词，如：know,love,like,looklike,want,hear,see,believe,look,smell,taste,feel,sound一般不能用于进行时态，因为他们不能表示正在进行的动作。Eg:Look!Therearesomesheeponthehill.Eg.Look!Theboatlookslikeaduck.Eg.Now.IwanttogotoBei