student asking question

How nuance will change if "like this chemical thing" replace to "like a chemical thing"?

teacher

Native speaker’s answer

Rebecca

Both "this" and "a" actually work in this context. You can swap out "this" for "a" without changing the nuance of the sentence. Many people use "this" when describing things in conversation, but "a" also works well here. Ex: He's like this great big teddy bear. = He's like a great big teddy bear.

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