文档介绍：+s;在以ch,sh,s,x或o结尾的词后+es(teaches,goes,washes,fixes,guesses);在以“辅音字母+y”结尾的词后,变y为i后再加-es(studies,tries),常与everyday,onceaweek,often,always,usually,sometimes,seldom等时间状语连用:-Wegotheretwiceamonth.-anizationrequiredforitsoperations.(-requires)、性格、能力等:-Hehasgreatconcernforothers.-:-Lighttravelsfasterthansound.-:-(when,after,before,assoonas,until;if,unless):-omorrow,wewillhaveafootballmatch.-e.(es)-ing;sit-sitting(forget-forgetting);die-dying通常不能用于现在进行时的常见动词如下:see,hear,smell,taste,know,find,forget,notice,suggest,be,love,like,want,hope,wish,prefer,hate,understand,remember,believe,have,consist,(说话时)正在进行的动作:-Thestudentsarerunningtothesports-,但此刻不一定在进行:-,e,leave,start等动词,后面也常用表示较近的将来时间状语,如tomorrow,tonight,ingFriday等,表示安排或计划好的事情:-:-Theboywhoissittingbesidemeisalwaysaskingmealotofwhysandhows.-:-:-It'?(这时常和since或for短语连用)-LihasstudiedEnglishfortwentyyears.-esincreasinglypopularduringthepastfiftyyears. b[注]:just,before,already,often,never,ever,always,not...yet或now,today,thisweek等;不用过去的时间状语。2.--Hehasbeeninthearmyfortwoyears.(不能说Hehasjoinedthearmyfor...)--.(.):yesterday,ago,in1978,once,lastweek(month,year),atthattime,justnow等,以及由when等引导的句子。:-OberlinCollegeawardsdegreestobothsexesin1837,butcoeducaioninAmerican acollegesdidnotspreaduntilthesecondhalfofthecent