首先，过去时词尾变y为i加ed的条件是：必须是辅音字母加y,且是规则动词。常见的有：
study--studied;
worry--worried;
try--tried;
terrify--terrified;
simplify--simplified
satisfy--satisfied
reply--replied
occupy--occupied
multiply--multiplied
hurry--hurried
envy--envied
deny--denied
cry--cried
dry--cried
fry--fried
copy--copied
classify--classified
clarify--clarified
carry--carried
apply--applied
