Hello.

What is the difference in meaning between these sentences?

- This is not as complicated as it sounds.
- This is not just as complicated as it sounds.
- This is not quite as complicated as it sounds.
- This is not nearly as complicated as it sounds.

Thanks.
You can't use 'just as' with a negative in this way. I can't think of any explanation as to why that is an exception, maybe it's just one of those English quirks, but you can't.

not as complicated as....fairly straightforward statement. This sounds complicated, but in reality it isn't. Or at least, not too bad.

Not quite as complicated ....it sounded very complicated and it IS complicated, but not quite as bad as I predicted. Although this could also be used ironically where something had sounded very complicated, but turned out to be not complicated at all.

Not nearly as complicated ...it sounded very complicated but in reality it wasn't (maybe just a little b it complicated)
i need konw the grammar of as....as, just as.....as, almost as....as, quiet as...as, nearly as....as
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What part concerns you? There is good explanation above already. Would you like to give us some sample sentences using them?
like, in a chess context, the move 1.d4] is just as good as [the move] 1.e4.what if 'just' is deleted?
soheil1 in a chess context, the move 1.d4] is just as good as [the move] 1.e4.what if 'just' is deleted?
'Just' is an intensifier. You may remove it without damaging the grammar of the sentence.
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