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I'm quite confused with the use of "would". Confusing use of would is below:

You use you would in negative sentences with verbs such as 'guess' and 'know' when you want to say that something is not obvious, especially something surprising.

⇒ Chris is so full of artistic temperament you'd never think she was the daughter of a banker.

⇒ Inside, he admits, his emotions may be churning, but you would never guess it.

Source: http://www.collinsdictionary.com/dictionary/english/would

What I'm confused(not understood) is as follows:

Why 'would' has been used in those examples? I don't know how to use 'would' in this way. Could you please interpret it?

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  • 2
    Didn't you ask the same question before? Wasn't that closed as 'too broad'?
    – Varun Nair
    Jun 8 '16 at 5:41
  • 1
    It's the edited question but not same question. I've separted the questions into 3
    – yubraj
    Jun 8 '16 at 6:14
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I think the answer is clearly shown in your question if you read it attentively.

1.You use would, or sometimes would have with a past participle, when you are expressing your opinion about something or seeing if people agree with you, especially when you are uncertain about what you are saying [vagueness]

Must is used mostly to express the deduction or coclusion that something is certain

The examples are in your question.

I would imagine she is quite lonely living on her own.(The speaker is uncertain about what he is saying).

She must be lonely living on her own.(The speaker thinks she is lonely )

Hope it helps.

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  • I mistakely posted. Now I've edited the question, i hope you'll your answer too.
    – yubraj
    Jun 8 '16 at 14:27
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would in this context is used to refer to a situation that you can imagine happening: see the POSSIBILITY section of the link that I have provided.

So, if you say "you would never guess...", it means that you cannot imagine somebody being able to guess...

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  • But why that says "something isn't obevious, especially surprising"
    – yubraj
    Jun 8 '16 at 14:21
  • If you can't imagine something, it is not obvous. If it turns out to be true, it's surprising.
    – JavaLatte
    Jun 8 '16 at 14:55

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