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Verbal expressions are of particular interest.

Is the above sentence correct or we should add an a before particular?

Verbal expressions are of a particular interest.

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The correct expression is "of particular interest" (in the negative, "of no particular interest").

"interest" in "of ... interest" is non-count (see below) and, therefore, does not take the indefinite article. It can only take determiners like some, certain, little: of some/certain/little interest.

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