was to be 后面加形容词 was to be 咋理解

1。过去将来时,be to do sth。即将做某事。例：He was to leave for shanghai the next morning。他第二天上午将动身去上海。2。动词不定式作表语,放在be后面。例：My dream was to be a singer when I was young。当我小时候我的梦想是当一名歌手。