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Can I say only "Do you know?" without saying the object in this case?:

I'm looking for a flower shop around here. Do you know?

How can I distinguish cases where I need to say object and where I don't need to?

2 Answers 2

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That is correct.

A dictionary can indicate if a verb requires a direct object. But in many cases you can guess, if meaning seems clear without an object, it probably doesn't need one (there are exceptions)

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    To me, it would seem natural to say "Do you know [of] one?" Otherwise, the question could (hypothetically) mean "Do you know that I'm looking for a flower shop?" Dec 13, 2021 at 9:01
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    I agree with your general point, but in this specific case, leaving out an object sounds strange and non-fluent. "Do you know?" by itself sounds like it's only referring to a fact.
    – stangdon
    Dec 13, 2021 at 12:41
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"Do you know?" by itself is grammatically correct, but not what a (US) native speaker would say here. Do you know? by itself would only be used if you had previously used a sentence about knowledge, like

When did King Frederick live? Do you know?

I don't know where he keeps his money. Do you know?

In this last example you could even just use Do you?, since know is the main verb.

If you use the bare Do you know? after a statement, it sounds like you're asking the other person if they know that statement, which is a strange thing to ask because you just told them.

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    It's not what any English speaker would say. I'm from the UK!
    – Billy Kerr
    Dec 13, 2021 at 15:46
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    While that seems to be the literal meaning of the question, since it's such a strange thing no one would interpret it that way. So the implied object is "where a flower shop is". It might not be a common way to ask, but it's also easily understood.
    – Barmar
    Dec 13, 2021 at 15:50

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