be to do sth”约定,注定,必定“要做什么.指的人是对未来的一种计划,安排。be about to do sth "正要做什么",be about to do sth when…"正要…这时…" 如:They were to meet at the usual place. 他们约好在老地方见. He was about to leave when the p...
about to是刚要去做某事. be to是打算好去做某事. be to do sth”约定,注定,必定“要做什么.指的人是对未来的一种计划,安排。be about to do sth "正要做什么",be about to do sth when…"正要…这时…" 如:They were to meet at the usual place. 他们约好在...