The sentence pattern is SV SC, where the subject is followed by a linking verb and a subject complement.
Sentence pattern: SV SC
In the sentence 'Mosquitoes are most prevalent at dawn and at dusk,' the subject 'mosquitoes' (S) is followed by a linking verb 'are' (LV) and a subject complement 'most prevalent at dawn and at dusk' (SC).
Example: The cat is black. (S LV SC)
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