现在进行时：
概念：表示现阶段或说话时正在进行的动作及行为.
时间状语：now,at this time,these days,etc.
基本结构：am/is/are+doing
否定形式：am/is/are+not+doing.
一般疑问句：把be动词放于句首.
现在进行时的基本用法：a.表示现在( 指说话人说话时) 正在发生的事情.We are waiting for you.b.习惯进行：表示长期的或重复性的动作,说话时动作未必正在进行.Mr.Green is writing another novel.(说话时并未在写,只处于写作的状态.) She is learning piano under Mr.Smith.c.表示渐变的动词有：get,grow,become,turn,run,go,begin等.The leaves are turning red.It's getting warmer and warmer.d.与always,constantly,forever 等词连用,表示反复发生的动作或持续存在的状态,往往带有说话人的主观色彩.You are always changing your mind.典型例题 My dictionary ___,I have looked for it everywhere but still___ it.A.has lost,don't find B.is missing,don't find C.has lost,haven't found D.is missing,haven't found.答案D.前句是一个仍在持续的状态,应用进行时,由于没有找到,其影响仍然存在,应用完成时,瞬间动词用于否定式时可用于完成时.