英语动词变名词、,r,双写加er或or:,sing_singer,wait_waiter,find_finder,,er,,win_winner,rob_robber,,:build_building,draw_drawing,end_ending,begin_beginning,swim_swimming,skate_skating,feel_feeling,say_saying,mean_meaning,cross_crossing,surf_surfing,:,describe_description,produce_production,celebrate_celebration,pronounce_pronunciation,decorate_decorationgraduate_graduation,frustrate-frustration,pollute_pollutioncontribute_contribution,congratulate_congratulation,nization,donate_donation,appreciate_appreciation,operate_operation,,invent_invention,attract_attractionimpress_impression,inject_injection,:know_knowledge,please_pleasure,enjoy_enjoyment,practise_practice,die_death,ess,weigh_weight,sit_seat,change_chance,enter_entrance,fly_flight,rob_robbery,discover_discovery,fail_failure,appear_appearance,:use-useful,care-careful,help-helpful,thank-thankfulpeace-peaceful,forget-forgetful,play-playful,eed-essful,wonder-:please-pleased,unite-united,excite-excited,surprise-anized,close-closed,wound-wounded,relax-relaxed,develop-developed,appreciate-appreciated,frustrate-frustrated,interest-
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