1、一般现在时表示经常发生或习惯性的动作或状态及客观现实和普遍真理。结构：1.主语be 动词2.主语动词原形 当主语是第三人称单数时，动词词尾加-s 或-es通常与 always , often , usually , every day , sometimes , once a week 等时间状语连用。一般过去时表示发生在过去的动作或存在的状态。结构：1.主语be 动词过去式2.主语动词过去式通常与表示过去的时间状语 yesterday, last night ,some years ago, in 1990,in those days.等连用。一般将来时表示将来发生的动作或存在的状态结构：1
2、.主语will/shall动词原形（第一人称用 shall）2. be going to动词原形常与表将来的时间状语 tomorrow, the day after tomorrow, next Sunday, soon, in a few days 等连用。现在进行时表示现在或现在这段时间正在进行的动作结构：主语+be(am, is, are)+ 动词现在分词 通常与 now, at present 等时间状语连用。过去进行时表示过去某一时刻或某阶段时间正在进行的动作结构 主语+be (was/were) + 动词现在分词通常与 at 6:00 yesterday, at this/ tha
3、t time yesterday, when 引导的时间状语等连用。现在完成时表示过去发生的动作对现在造成的影响结构 主语+ have/has + 动词过去分词通常与下列时间状语连用 up to now, in the past, recently, by , for 5 years, since 1994, so far, already, yet, ever, just第三人称单数变化形式a)一般情况动词在词尾加-s .come-comes speak-speaks work-works live-livesb)以 o, s, x, ch, sh 结尾的单词在词后加-es.do-does
4、go-goes finish-finishes brush-brushes pass-passes watch-watchesc)以“辅音字母y”结尾的单词变 y 为 i 加-es.Study-studies carry-carries cry-criesd)以“元音字母y”结尾的单词直接加-s.play-plays stay-stays动词过去式变化规则。a)一般情况下的词加-ed.work-worked call-called laugh-laughed finish-finished knock-knockedb)以不发音的字母 e 结尾的单词直接加-d .live-lived chan
5、ge-changed smoke-smoked die-died drive-drovec)以“辅音字母y”结尾的单词，变 y 为 i 加-ed.study-studied carry-carried cry-cried try-tried d)以“元音字母y”结尾的单词直接加-ed.play-played stay-stayede)以“一个元音字母一个辅音字母”结尾的单词应先双写这个辅音字母然后再加-ed.stop-stopped plan-planned pat-patted动词现在分词的构成 一般动词直接在词后加-ingdo doing read - readingwork workin
6、g think thinkingstudy studying go goingwatch watching jump - jumping 以不发音的字母 e 结尾的动词，应先去掉 e 然后加 inglike liking take takingleave leaving live livingreceive receiving dance dancingcome coming smoke smokingwrite - writing 以“一个元音字母 + 一个辅音字母”结尾的动词，应先双写这个辅音字母然后再加-ingstop stopping begin beginningdig digging swim swimmingrun running sit sitting(注意：listen listening open opening eat eating rain raining sleep - sleeping)
