be to
第三人称
is to
现在进行时
being to
过去式
was to
过去完成时
been to
1
将要, 预计
used for expressing possibility or for indicating something that is due to happen or take place
- The president is to arrive in the country tomorrow.
总统将于明天抵达该国。
- If we are to win this game, we must play our best.
如果我们要赢得这场比赛，我们必须发挥出最好的水平。
- The meeting is to start at 10 a.m.
会议定于上午10点开始。