teach后面的动词用什么形式？  用动词不定式形式：teach sb to do  教某人做某事  He promised to teach her to water-ski.  他答应教她滑水。  You can teach some parrots to talk.  可以教某些鹦鹉说话。  We should teach the children to know good from bad.  我们应教育儿童分辨是非。  Parents ought to teach their children to behave themselves.  父母应教导孩子举止得体。  He taught me to obey all commands without asking questions.  他教我毫无疑义地服从命令。