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I know we can say: "What nice weather!" and "What lovely flowers!", but I'm not sure if we can replace the "what" with "how", like:

How nice weather!

How lovely flowers!

Can I really say in that way? Please give me your opnion, thank you!
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ViceidolI know we can say: "What nice weather!" and "What lovely flowers!", but I'm not sure if we can replace the "what" with "how", like:

How nice weather!

How lovely flowers!

Can I really say in that way? Please give me your opnion, thank you!
No, these changes are not correct.
If you want to use "how," you need to include a verb:

How nice the weather is today! How lovely your flowers are!

One other option, though less common than "what" is "such" :

Such nice weather! Such nice flowers!
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May I ask one more question? How about "How nice a dress!"? Is this acceptable?

Thanks again!
Not really.

How nice your dress is!

What a nice dress!
Grammar Geek
Not really.

How nice your dress is!

What a nice dress!

But I saw a similar structure in one of my grammar books. It reads:

Miss Langham arm in arm with Mr. Peabody—how astonishing a sight!

May I ask is this sentence is wrong? Thank you!!
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There's nothing wrong with that sentence, it's just old-fashioned. You wouldn't put it that way today, unless perhaps you were teasing.