过去式的读音有3种,分别为t,d,id
它们的读音遵循“清清元浊”的原则,即：
1.清辅音后发t,如：brushed,hoped,asked
2.元音和浊辅音后发d,如：closed,opened,played,
t,d音结尾的单词则发id,surported,needed