动词的过去式分词规则变化的规律

规则动词过去式加“ed”后的发音规则：
在浊辅音和元音后面 [d]
called borrowed
moved[mu:vd] enjoyed
welcomed answered
在清辅音后面 [t]
asked finished
helped[helpt]
passed[pa:st]
reached
在[t]音后面 [id]
wanted['wCntid] started['sta:tid]
[d]音后面[id]
needed['ni:did] counted['kauntid]0
清：／p／／t／／k／／f／／F／s／／W／／tF／／ts／／tr／
浊：／b／／d／／g／／v／／V／／z／／T／／dV／／dz／／dr／
补充说明：
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—cleaned
2. 以不发音的e结尾的在词尾加-d。如：like—liked, live—lived, use—used, move—moved
3. 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—tripped
4. 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—beat
2. 以d结尾的词，把d变成t。如:build—built, lend—lent, send—sent, spend—spent
3. 以n结尾的词，在词后加t。如：mean—meant, burn—burnt, learn—learnt