原型,过去式,现在完成时都相同的单词,越多越好.

09underrun
undersell \x09undersold \x09undersold
underset \x09underset \x09underset
undershoot \x09undershot \x09undershot
understand \x09understood \x09understood
undertake \x09undertook \x09undertaken
underwrite \x09underwrote \x09underwritten
undo \x09undid \x09undone
undraw \x09undrew \x09undrawn
unfreeze \x09unfroze \x09unfrozen
ungird \x09ungirded, ungirt \x09ungirded, ungirt
unhang \x09unhung \x09unhung
unknit \x09unknitted, unknit \x09unknitted, unknit
unlade \x09unladed \x09unladed, unladen
unlay \x09unlaid \x09unlaid
unlearn \x09unlearnt, unlearned \x09unlearnt, unlearned
unmake \x09unmade \x09unmade
unreeve \x09unrove, unreeved \x09unrove, unreeved
unsay \x09unsaid \x09unsaid
unset \x09unset \x09unset
unsling \x09unslung \x09unslung
unspeak \x09unspoke \x09unspoken
unstick \x09unstuck \x09unstuck
unstring \x09unstrung \x09unstrung
unswear \x09unswore \x09unsworn
unteach \x09untaught \x09untaught
unthink \x09unthought \x09unthought
untread \x09untrod \x09untrodden, untrod
unweave \x09unwove \x09unwoven
unwind \x09unwound \x09unwound
upbuild \x09upbuilt \x09upbuilt
upcast \x09upcast \x09upcast
uphold \x09upheld \x09upheld
uppercut \x09uppercut \x09uppercut
uprise \x09uprose \x09uprisen
upset \x09upset \x09upset
upsweep \x09upswept \x09upswept
upswing \x09upswung \x09upswung
wake \x09waked, woke \x09waked, woken, woke
waylay \x09waylaid \x09waylaid
wear \x09wore \x09worn
weave \x09wove \x09woven
wed \x09wedded, wed \x09wedded, wed
weep \x09wept \x09wept
wet \x09wetted, wet \x09wetted, wet
will \x09would \x09-
win \x09won \x09won
wind \x09winded, wound \x09winded, wound
wit \x09wist \x09wist
withdraw \x09withdrew \x09withdrawn
withhold \x09withheld \x09withheld
withstand \x09withstood \x09withstood
work \x09worked \x09worked
work \x09wrought \x09wrought
wring \x09wrung \x09wrung
write \x09wrote \x09written