can can没有第三人称 单数和现在分词形式 cook cooks cooking dance dances dancing、do does doing 、drink drinks drinking 、drive drives driving 、 like likes liking 、listen listens listening 、look looks looking 、play plays playing 、 put puts putting 、read reads reading 、ride rides riding 、run runs running 、say says saying 、 see sees seeing 、sing sings singing 、sit down sits down sitting down 、speak speaks speaking、spell spells spelling 、stand up stands up standing up 、study studies studying 、 swim swims swimming 、thank thanks thanking 、touch touches touching 、type type typing 、 walk walks walking 、work works working、