过去式双写

.regret(regretted,regretting)后悔2.control(controlled,controlling)控制3.admit(admitted,admitting)承认4.occur(occurred,occurring)出现5.prefer(preferred,preferring)宁愿6.refer(referred,referring)提到7.forget(forgetting)忘记8.permit(permitted,permitting)允许9.equip(equipped,equipping)装备plan--plannedban--bannedbat--battedbeg---beggedship--shippedskip--skippedspin--spinnedshop--shoppedslot--slotted