1、清念 /t/ ，即 ed 在清辅音后面念 /t/ ,例：finished helped passed cooked
2、元浊 /d/ ,即 ed 在元音，浊辅音后面念 /d/ ,例：borrowed enjoyed called moved
构成规则
1、一般在动词原形末尾加– ed look looked
play played
start started
2、结尾是 e 的动词加 -- d live lived
hope hoped
use used
3、末尾只有一个辅音字母的 stop stopped
重读闭音节词，先双写这个 plan planned
辅音字母，再加—ed trip tripped
4、结尾是“辅音字母+y”的动词， study studied
先变“y”为“i”再加—ed carry carried
温馨提示：
