English is a world language and grammarians' terms vary from country to country. I think let is unanimously considered an imperative in your sentence but there can be called several names. I have seen it called a dummy there , which has always sounded rather amateurish to my ear, a formal subject and a preparatory there.
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Cool BreezeI think let is unanimously considered an imperative in your sentence
Mr WordyDo you think that's wrong, or can it be an imperative and a subjunctive?As I said, terms vary. I wouldn't be surprised if some grammarians thought of let as a subjunctive. As there are so few verb forms in English and so many idiomatic ways to use them, these few forms sometimes defy classification.