过去式的构成　

过去式的构成　 过去式的构成: 动词的过去式可分为规则动词和不规则动词。 规则动词的过去式变化如下: 1、一般情况下，动词的词尾加 -ed ，如: work-worked play- played want-wanted act -acted 2、以不发音的 -e 结尾动词，动词词尾加 -d，如: live-lived 3、以辅音字母 + y结尾的动词，把-y变为-i 再加-ed，如: study-studied try- tried cry-cried carry-carried -ed， 4、以一个辅音字母结尾的重读闭音节动词，双写词尾辅音字母，再加 如: stop-stopped drop- dropped plan- planned 注:不规则动词的过去式变化规律性不强，须多加记忆。 go - went make - made get - got buy - bought come – came fly-flew do-did take-took 动词第三人称单数的变化规则: 1、一般的直接在动词后+s like- likes play-plays 2、以s, x, sh, ch, 接尾的动词+es wash-washes watch-watches 3、以辅音+o接尾的动词+es go-goes do-does 4、以辅音+y接尾的动词:变y为i +es fly-flies try-tries half an hour =a half hour 半小时 an hour and a half 一个半小时