规则动词词尾加-ed有三种发音规律：1、在清辅音后读作[t]。如：asked,helped,watched,stopped；2、在浊辅音和元音后读作[d]。如：enjoyed,studied,moved,called；3、在t/d后读作[id]。如：wanted,needed。
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
