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How to speak in English fluently?

I'm researching the difference between "surprised at" and "surprised with". I am not a native English speaker so I would like to hear from a native English speaker.

1) In what cases is a "surprised with" sentence acceptable?...

In English grammar, some words can function as different parts of speech depending on their usage in a sentence example, "run" can be a verb or a noun. Identify a word that can serve as at least three different parts of speech. Provide example sentences for each usage and explain how the word's m...

Can I say

“Their posts were filled with hate speech on her.”

or

“Their posts were filled with hate speech against her.”

Could they both be used interchangeably?

Thanks in advance.