ENG past tense

x 字頭
1) x-rayed

Y字頭
1) yakked
2) yanked
3) yapped
4) yawned
5) yearned
6) yelled
7) yellowed
8) yielded
9) yodeled
10) yoked
11) yowled
12) yuppified

Z 字頭
1) zapped
2) zeroed
3) zigzagged
4) zinged
5) zipped
6) zoned
7) zoomed

2008-10-30 18:27:19 補充：
to farbrian114:

'zone' can be used as a verb.
see yahoo dictionary
http://hk.dictionary.yahoo.com/search.html?q=1&s=zone

X 既 past tense = Xed

Y既past tense = Yed

Z既past tense = Zed

xeroxed

yuk,yelled,yapped,yearned,yelped

zapped,zigzagged,zinged,zipped,zoomed

2008-10-29 22:10:43 補充：
to kaizi94:zoned is adj.