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For example: He walks out to find out what's suspicious.


Idk for whatever reason “what suspicious is” sounds wrong to me


However with verbs and nouns it sounds perfectly normal:


I don't know what your problem is

I wonder why he left his job

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thatkoko666... you don't change the location of ‘be’ when there's an adjective even in affirmative sentences.

Correct. It's subject-verb relationships that count, not modifiers.

The only exception that comes to mind is the case where the adjective is a reference to itself as a word and is therefore not a modifier.

— My house is worth $1.5 million! I'm rich!
— Dream on. You have no idea what rich is.

CJ

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thatkoko666Idk for whatever reason “what suspicious is” sounds wrong to me

Is is strange... It needs more:

He walks out to find out what's making the suspicious noise.

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Comments  

He walks out to find out what's suspicious


It sounds normal to me. Doesn't it?

Or a most common example:


I don't know what's wrong (not what wrong is)


I'm fairly certain you don't change the location of 'be'(is am are were was, etc) when there's an adjective even in affirmative sentences.

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 CalifJim's reply was promoted to an answer.