以元音字母加y结尾的单词在变得数时直接在词尾加s,例如单词boy就是以一个元音字母+y结尾,它的复数是直接在词尾加s,结果是boys.而butterfly虽然也以y结尾,可是它没有以元音字母加y结尾,而是用l+y结尾,所以它变复数时不能直接在词尾加s,而是要把y变为i,再加es,结果是butterflies.

一)一般在词后加s。如:comes, spells, waits, talks, sees,dances, trains

二)在x,sh, ch, s, tch后加es。如:watches,washes, wishes, finishes

三)1)以辅音字母加y结尾的变y为i再加es。如:study-studies, hurry-hurries, try-tries 2)以元音字母加y结尾的直接加s。如:plays, says, stays, enjoys, buys