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Hi, I googled before I came here to ask, but didn't get a clear answer.

I often say 'Don't take it serious', but I also know many people say 'Don't take it seriously'

The reason is I think 'serious' as "an object complement" of the object "it", whereas others consider 'seriously' as "an adverb" for the verb "take" in the sentence. I think they both are considerable. (maybe it depends on whether you speak AE or BrE?, I don't know.)

Another example would be; Take it easy vs. Take it easily

Ok, lets say they are all ok grammatically, but what about when it's in a passive sentence like this?

The feedback needs to be taken seriously.
The feedback needs to be taken serious.

I would definitely use the former one (seriously=adverb). But, would the latter one possibly be correct by any chance (Assuming you think 'Don't take it seriously' and 'Don't take it serious' are both correct)?
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'Don't take it seriously. - Correct. The adverb is the part of speech that is needed.
Don't take it serious. - not correct.
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"Easy" is also an adverb, and it means something different from "easily".
dont take it seriously
dont take it be serious
Anonymousdont take it seriously
Don't take it seriously. This is correct.
Anonymousdont take it be serious
This is not correct.
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What about if they add " so"?like "don't take it so seriously ?" Is it still correct?it sounds odd to me
anonymousWhat about if they add " so"?like "don't take it so seriously ?"

That changes nothing.

anonymous Is it still correct?

Yes.

anonymousit sounds odd to me

I'm sorry.

How about "don't take it too serious" is it correct?
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You need the adverb form (seriously) not the adjective (serious) to be grammatically correct.

He is a serious scholar. (adjective)

He looked at me seriously. (adverb).

Don't take it too seriously. (adverb)

It is a serious matter. (adjective)