Don't be sad VS don't sad

Polyester

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Don't be sad VS don't sad

Whats the difference between two sentences?

When I omitted the word "be" ...
 

teechar

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"Don't sad" is impossible on its own. It's possible to say, e.g., "Don't sad stories seem boring?", but that's completely different.
 

emsr2d2

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"Don't be sad​" [STRIKE]VS[/STRIKE] vs "Don't sad".

What's the difference between those two sentences (no question mark here) [STRIKE]When[/STRIKE] given that I omitted the word "be" in the second? [STRIKE]...[/STRIKE]

See my corrections above.

"Sad" is an adjective not a verb. The imperative "Don't" (as an instruction) must be followed by the bare infinitive of the relevant verb.
 

Tdol

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And the verb from sad is sadden, though Don't sadden wouldn't work on its own either.
 
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