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 some words to use besides "the"?
What words can I use in place of "this"?
What sentence starter can I use instead of "the"?
What are other words can I use instead of "I"?
What other words can I use instead of "I"?
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