正常的变化形式:
breaksbreaking,buysbuying,eatseating,fallsfalling,feedsfeeding,findsfinding,holdsholding,keepskeeping,meetsmeeting,readsreading,sayssaying,
单三加es的:
catches,catching,doesdoing,teaches,teaching,goesgoing,
现在分词去e,加ing的:
comescoming,givesgiving,makesmaking,shakesshaking,
现在分词最后字母重复的:
getsgetting,runsrunning,shutsshutting,sitssitting,
单三形式特殊的:
hashaving,
go的三单是:goes