问几个关于英语的小问题

从左到右依次是这些单词的：原型，过去式，过去分词，第三人称单数和现在分词

add added added adds adding
ring rang rung rings ringing
terrify terrified terrified terrifies terrifying
chew chewed chewed chews chewing
kiss kissed kissed kisses kissing
stay stayed stayed stays staying
chat chatted chatted chats chatting
develop developed developed develops developing
bother bothered bothered bothers bothering
compete competed competed competes competing