Welcome to the forum.
Please note my corrections above. It's important to follow these rules of written English at all times:
- Start every sentence with a capital letter.
- Always capitalise the word "I" (first person singular pronoun).
- End every sentence with an appropriate closing punctuation mark. Closing punctuation marks are a full stop, a question mark or an exclamation mark.
- Don't put a space before a comma, full stop, question mark or exclamation mark.
- Always put a space after a comma, full stop, question mark or exclamation mark.
- Don't put a space after opening quotation marks.
- Don't put a space before closing quotation marks.
I have added more words to your suggested revision. I'm sure you know that "already seen" can't possibly be an alternative version of "Have you ever seen this?" I have also extended your thread title so that it is unique.
Both sentences are grammatical but they don't mean the same thing. Context would dictate which one you need.
In future, remember that you don't need to say "Thanks" in your post. Thank us after we help you, by clicking on the
icon, which you can find by hovering your cursor over "Like" in the bottom right-hand corner of all responses.