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  1. The moon shone bright like a diamond in the sky. 2. The full moon is shining bright in the sky. Why not they are brightly? Are they correct?

marked as duplicate by Jason Bassford Supports Monica, linguisticturn, Lawrence, tchrist Jan 20 at 13:49

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  • Hi Mathew K.J., your question is off-topic because it can be answered using commonly available resources (i.e. a free online dictionary like this one). Moreover, EL&U has a 'research requirement': you're supposed to show research you've done trying to find the answer yourself. – linguisticturn Jan 20 at 11:26
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Both bright and brightly are fine. They are both adverbs but bright is an adjective.

You could even use them in one sentence:

The sun shone brightly; its rays were so bright.

You wouldn't use brightly without a verb as it is an adverb, not an adjective and make no sense.

You wouldn't say:

The sun is brightly

But as bright is an adjective, as well as an adverb so you could use:

The sun is bright

So really it depends on the context and whether you already have a verb in the sentence.

In your examples, both would be correct.

The moon shone brightly like a diamond in the sky.
The full moon is shining brightly in the sky.

I put the verb is bold. As there is a verb before brightly it can be used as an adverb and is correct.

  • 1. To be is a verb so it’s not just “whether you already have a verb in the sentence”; and 2. The question is asking about sentences where bright is used adverbially after the verb shine, which constellation you don’t mention at all. – Janus Bahs Jacquet Jan 20 at 11:03
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According to Oxford Dictionaries, bright is not only an adjective but also an adverb, usually used with the verbs burn and shine. Therefore, both are correct. However, in speech brightly is almost always used over bright. (British English) Bright is mostly used in poetic, literary forms.

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    Maybe in your speech you only use brightly. Do you have any evidence that everybody else does as well? Americans tend to use flat adverbs like bright much more often than the English, and my impression (living in Massachusetts) is that it's quite common in speech here. – Peter Shor Jan 20 at 10:44
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    @PeterShor Moreover, Rihanna has made sure the phrase “shine bright like a diamond” is more or less fixed. “Shine brightly like a diamond” actually sounds borderline unacceptable to me. – Janus Bahs Jacquet Jan 20 at 10:59

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