he went to the supermarket to buy some food 不定式充当主语的补语吗

　　不是补语,而是目的状语.He went to the supermarket to buy some food.他去超市（为了）买一些食物.恩 我想问的是有没有不定式充当 主语补语的情况有。例如；He as asked to tell a story。有人叫他讲个故事。to tell a story就是主语补语。能举例不定式做同位语的吗The teacher arranged us a task（ to help the girl clean the room tomorrow）（任务的内容同位语）。My wish to visit France has come true at last year不定式为什么充当定语这是修饰主语my wish的定语，我参观法国的愿望。如果这样：My wish，to visit France，has come true last year。就可以认为是主语的同位语。就是说不定式充当定语不一定 与被修饰词构成动宾关系喽Right.