一些词的过去分词和过去式

have had had
make made maken
invite invited invited
study studied studied
blow blew blown
sell sold sold
build built built
spell spelt spelt
fit fit fit
stay stayed stayed

had had
maken maken
invited invited
studied studied
blew blown
sold sold
built built
spelt spelt
fitted fitted
stayed stayed

.....现在小孩子都不好好学习了。