What am I suppose to be doing?的句式结构是怎样的?

What am I suppose to be doing?的句式结构是怎样的? I am a student in a college的句式结构是怎样 suppose sb./sth.(to be) +形容词 / 介词短语的结构与suppose sb./sth.to ha be suppose to的意思? what I suppose to be 还有 what I suppose to do . What am I suppose to do without you正确吗? i am grateful to be employed by you.请问to be的语法结构 现代汉语的句式结构是怎样的? consider to be doing 是一个怎样的用法? I myself am a teenager.语法结构是怎样的. 求一首英文歌,男人唱的,里面好像有句歌词“it is what friends suppose to be.”然后后面是 be suppose to用于物体的用法