动词不定式中to do 中to的词性,肯定不是介词,介词后应是doing,每个单词...答:9:另外还有一些名词符合这种用法,有的具有两者息息相关,缺一不可的含义.如:key to door,invitation to party,guide to action,limitation to life,accessory to school 四:to还具有依据,伴随,和着节奏的含义,如:sing to piano, chance to the tune, stamp to the rhythm of the song, add salt...