现在分词形式的规律是什么谢谢了,

规则动词的过去式由“动词原形+-ed”构成,具体变化有：1. 直接在词尾加-ed.如: want—wanted, work—worked, need—needed, clean—cleaned2. 以不发音的e结尾的在词尾加-d.如：like—liked, live—lived, use—used, move—moved3. 以一个元音字母加一个辅音字母结尾的重读闭音节动词,先双写结尾的辅音字母,再加-ed.如：stop—stopped, trip—tripped4. 以辅音字母加y结尾的动词,先把y变成i,再加-ed.如：study—studied, carry—carried, hurry—hurried, marry—married不规则动词的过去式见课本后的不规则动词表.大体上归纳有以下六条记忆法：1. 以t结尾的词,过去式与原形相同.如：put—put, let—let, cut—cut, beat—beat2. 以d结尾的词,把d变成t.如:build—built, lend—lent, send—sent, spend—spent3. 以n结尾的词,在词后加t.如：mean—meant, burn—burnt, learn—learnt4. 以ow / aw结尾的词,把ow / aw变成ew.如：blow—blew, draw—drew, know—knew, grow—grew5. 含有双写字母的词,将双写改为单写,在词尾加t.如：keep—kept, sleep—slept, feel—felt, smell—smelt6. 含有元音字母o / i的词,将o / i变成a.如：sing—sang, give—gave, sit—sat, drink—drank规则动词词尾加-ed有三种读音：1. 在清辅音后读作[t].如：asked, helped, watched, stopped2在浊辅音和元音后读作[d].如：enjoyed, studied, moved, called3. 在t / d后读作[id].如：wanted, needed现在分词的构成方法如下 ： 一般情况下,直接在动词原形后面加 -ing.going asking finding working being seeing printing raining standing studying speaking spelling以不发音的-e 结尾的动词,去-e ,再加-ing. coming taking firing encircling writing becoming breathing leaving闭音节的单音节词,或以重读闭音节结尾的多音节词,这些词的末尾只有一个辅音字母时,双写这个辅音字母,再加 -ing.sitting running getting cutting stopping beginning planning permitting一般现在时主语单三人称时的动词变化①在一般现在时中,当主语为第三人称单数时,动词要用“s”型（即第三人称单数形式）.②所谓动词“s”型的构成,可按名词变复数的规则来记,即：i）在动词尾直接加 s.如：play—plays, want—wants, work—works, know—knows, help—helps,get—getsii）以字母s、x、ch或o结尾的动词加-es；如：guess—guesses, fix—fixes, teach—teaches, brush—brushes, go—goes,do—does,watch—watches,catch—catchesiii）以辅音字母＋y结尾的动词,先变y为i,再加-es.如：study—studies,carry—carries,fly—flies,worry—worries③④强调如何将主语是第三人称单数的肯定句变为否定和疑问句.现举例说明（用划线部分来说明顺口溜）：1）His mother works in a factory．His mother doesn’t work in a factory．Does his mother work in a factory?2）Mr Li teaches us English．Mr Li doesn’t teach us English．Does Mr Li teach you English?3）My brother studies maths well．My brother doesn't study maths well．Does your brother study maths well?