一个很简单的英语语法问题

我觉得这是靠记忆的
末尾只有一个辅音字母的重读闭音节词,双写该辅音字母,再加-ed 就像stop
plan
fit stopped
planned
fitted stopped [stCpt]
planned [plAnd]
fitted [5fitid]
以-r音节结尾的词,双写r字母,
再加-ed prefer
refer preferred
referred preferred [prI`f:d]
referred [ri5fE:]
还有(ING的)
重读闭音节结尾的动词,如果词尾只有一个辅音字母,要将该辅音字母双写,再加-ing cut
stop
fit
begin
forget cutting [5kQtiN]
stopping [5stCpiN]
fitting [5fitiN]
beginning [bi5^iniN]forgetting [fE5^etiN]