C) 表示“即将、正要”时，可用be about to do。强调近期内或马上要做的事，后常与when连用。ex: I was about to speak when you interrupted me.
D)"be to do"的5种用法：
a) 表示“按计划、安排即将发生某事或打算做某事”。
例：She is to be seen in the lab on Monday.（星期一你准会在实验室见到她。)
b) 该做或不该做的事情（语气上接近于should, must, ought to, have to)，表示一种命令、规劝性语气。
例：You are to go to bed and keep quiet, kids. Our guests are arriving in less than 5 minutes.（孩子们，你们必须 上床睡觉，不准吵闹。我们的客人5分钟之内就要到了。)
c) 能或不能发生的事情（接近can, may)
例：How am I to pay such a debt?（我怎么可能还得起这么大的一笔债呢？)
d) 不可避免将要发生的事情，后来将要发生的事情。
例：I assure you that the matter _______ as quickly as possible. Have a little patience.
A. will be attended B. will be attended to
C. is attended D. is attended to
will be attended to关键的一点是：attend表示“处理，解决”时是不及物动词，必须与to连用。另外，从上下文看，事情显然尚未解决，所以应该用将来时的被动语态。答案是B。
A) is to be B) can be C) will be D) has been
答案是A) is to be。全句的意思是：“如果要避免食品短缺，就必须作出更大努力来增加农业产量。”
E) 同样可以表示“正要、将要”的意思的句型是be on the point of doing。 The coach is on the point of giving up the game because our team has been scored 7 points.
注意：
在 以if, when, as long as, as soon as, after, before, in case, until, unless 等连词以及具有连词作用的副词（immediately, the moment, directly)等引导的状语从句，一般用现在时代替将来时。强调 延续性或动态时，可用完成时。
例：I hope his health will have improved by the time you come back next year.（我希望到明年你回来的时候，他的身体已经好多了。)
10. 将来进行时(will be doing) 调在将来的某个具体时间正在发生的动作或事情。
ex: Don't worry, you won't miss her. She will be wearing a red T-shirt and a white skirt at that time.
11. 将来完成时(will have done) 表示从将来的某一时间开始、延续到另一个将来时间的动作或状态，或是发生在某个将来时间，但对其后的另一个 将来时间有影响的动作或状态。就好象把现在完成时平移到时间轴的将来时时段一样。其用法从和过去及现在有关，变成了和将来及将来的将来有关。
ex: It is reported that by the end of this century the people of Chinese will have increased by 2 billion.
