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"be going to +動詞原形"通常表示"打算在近期或?qū)硪瞿呈?quot;,但也可以表示說話人根據(jù)已有的跡象認(rèn)為非?？赡芗磳l(fā)生某事。如:

She has bought a length of cloth； she is going to make herself a dress.

Look at these black clouds？It is going to rain.

2. "be to + 動詞原形"表示按計(jì)劃、安排或打算將要發(fā)生的動作。如:

We are to produce 100,000 computers next year to meet the market demand.

但是,如果不是人所能安排的動作,就不能用be to do句型表示將要發(fā)生。如:

I think I am to faint. ( ×)

I think I am going to faint. ( √)

3. 用"be about to + 動詞原形"表示"即將；正要；馬上就要"。如:

Let’s go in. The class is about to begin.

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