Generally, you do not want to use "this" without a noun. You should say "this sweater," "this idea" or "this surprising circumstance." Other ways to say the thing being referred to can be a synonym for the item.
What are some substitutes for starting a sentence with the word '"this"?
What are other words can I use instead of "I"?
What would be another way to say, "I believe that...?"
Does an essay have to have a bibliography?
Can you end a sentence with “that is"?
How would you substitute a word for "she" and "he" if you’re writing about a specific person?
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