bake,boil,discuss,enter,fry,keep,mean,steam的过去式 过去分词 现在分词是什么

依次为现在分词-过去式-过去分词：
bake-baking-baked-baked
boil-boiling-boiled-boiled
discuss-discussing-discussed-discussed
enter-entering-entered-entered
fry-frying-fried-fried
keep-keeping-kept-kept
mean-meaning-meant-meant
steam-steaming-steamed-steamed