He ≠ to clean the room

因此,把句(1)中的 to clean the room 分析为表语,是站不住脚的。

那么,该如何分析句(1)中的 is to clean...呢?应当搞清楚,这里的 is 并不是连系动词,而是 be to 这一情态习语的组成成分。be to 的意义是:“将”“计划”“安排”“应该”“必须”[have(got) to, ought to]:

1. The Queen is to have a holiday. 女王将去度假。(be to 表示将来)

2. The committee is to meet today. 委员会定于今天开会。(be to 表示计划、安排)

3. Their daughter is to be married soon. 他们的女儿马上就要结婚了。

4. The Prime Minister is to visit Canada next month. 首相定于下月访问加拿大。

5. The message is this: You are to go to the hotel where rooms have already been booked for you. 他给你们留下话:你们(应当)去旅馆,房间已经给你们定好了。

6. They usually write exact instructions how the music is to be played. 他们通常还要为如何

演奏他们的乐曲写出精确的说明。

应当注意,连系动词 be + to-v 跟情态习语 be to + v 在形式上是完全一样的,因此,只能从语义上来区分这两种不同的结构,见 $\mathrm{<span\; class="latin-run">b</span>}\mathrm{<span\; class="latin-run">e</span>}\mathrm{<span\; class="latin-run">t</span>}{\mathrm{<span\; class="latin-run">o</span>}}^2$be\ to^{2} 。

请做下面的英语试题：

1. In such dry weather, the flowers will have to be watered if they ____. A. have survived B. are to survive C. would survive D. will survive(上海高考,01-32)

2. I feel it is your husband who ____ for the spoiled child.

A. is to blame B. is going to blame

C. is to be blamed D. should blame(上海高考,02-24)