If this all sounds miserable, it isn't.

Why not "it doesn't"?


What is the context? Considering the sole sentence, I guess isn't is used because If this all sounds miserable, it isn't (miserable). But if the context is that that doesn't sound miserable, then it should be doesn't. If this all sounds miserable, it doesn't (sound).
Why not "doesn't"?

Because you are negating "miserable", not "sounds".

(Even) if all this sounds as if it is miserable, it isn't (miserable).


If all this sounds a certain way, it doesn't (sound that way).

The second is impossible, or at least very rare, because you don't usually say that if something is X, then it isn't X.
The first makes more sense, because you can easily say that something seems, appears, sounds, resembles, gives the impression of X, but nevertheless it isn't X.

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Got it. Thank you.
Dear Jim,

I have a question. Why did you say "because you are negating 'miserable'" instead of "because you negate/negated 'miserable'"?
you are negating (present progressive) can be used here to mean "One's intention is to negate (the one word and not the other)." Other tenses cannot be used with that meaning. It's a typical "Why?" "Because" exchange.

-- Why can't we just scream at the ticket agent?
-- Because we are trying to be polite. (It is our intention in this situation to try to be polite.)

-- Why did the cashier check the box marked CC?
-- Because you're paying with a credit card. (It is your intention in this situation to pay with a credit card.)

-- Why did they press that button at the intersection?
-- Because they're crossing the street. It controls the traffic lights.

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