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
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