"Did the noisy animals disturb you? Yes. They disturbed us."
Translation:lISuj'a' Ha'DIbaHmey chuS? HISlaH. nuSuj.
Notice that this is a question and answer. When you read the question, it is impossible to tell whether the "you" is singular or plural. But then the answerer says "us", so we know that the original question was asked to multiple "you" and lI- must be the appropriate prefix on the question.