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因为有竞争者 will。如果有两个词可以表示相同的意思，其中一个就会被淘汰。在这里就是shall被淘汰。
Bas Aarts there. And interrogative means a question.So it’s not just in nature that we get survival of the fittest– you know, the struggle for life – it happens in language too. Similar words are competing with each other, and some lose while others win out – or succeed after a fight. Do you know of any other modal verbs that are on their way out, Alice?
上述是Bas Aarts的看法。 interrogative是指疑问句。不仅自然界中有适者生存的法则，语言中也有这条原则。类似的词汇会彼此竞争，在竞争中有的会胜出有的会被淘汰。你还知道其他逐渐消失的情态动词吗？
Yes – must is declining rapidly. 
恩，must的使用也在快速下降。
Why’s that?
为什么呢？
Must sounds authoritarian, and people are choosing to express obligation– or having a duty to do something – in different ways.
Must听上去有些独裁主义，人们选择用不同的方式表达指责，或者说有义务做某事。
OK, authoritarian means demanding that people obey you. For example: Alice, you must move on to the next point, now!
独裁主义是指要求别人遵循自己的命令。例如：爱丽丝，你必须快说下一个重点！立刻！
Oh, you scared me a bit there, Neil!
天，你有点吓到我了，尼尔！
Exactly. I can see why people are shying away from – or avoiding –must.It sounds nicer to soften obligation by saying things like, You might want to move on to the next point now, Alice.
确实。所以可以看出人们为什么回避说must。如果这么说就会听上去柔和一些，爱丽丝，也许现在你想进行下一个话题。
OK, then, I shall. Let’s talk about tenses.Progressive tenses – formed from the verb be and the suffix –ing – are usually used for ongoing situations,for example, I‘m doing the show with Neil at the moment. But its use has been increasing rapidly.Let’s listen to Michael Rosen and Bas Aarts again talking about this.
好的。我们来谈谈时态。进行时由be动词和动词ing形式构成，通常用于正在发生的场合，例如，我现在在和尼尔做节目。但是这种时态的使用在快速增加。我们再听听 Michael Rosen和Bas Aarts 继续谈论这点。
It started increasing dramatically in the 19th century and has continued to rise in the present day.
进行时的使用率在十九世纪时显著增加，如今也呈上升趋势。
I think that‘s a cue for me to say, I‘m loving it, is that right?
对我来说，说我就喜欢它有一种暗示意味，是吗？
Well, that is one of the constructions that is coming in, I mean, I sometimes call it the Big Mac progressive because of course McDonald’s use that.
这是一种造句，我有时会称它为巨无霸进行时，因为麦当劳会用这种说法。

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