Episode #125 of the Stack Overflow podcast is here. We talk Tilde Club and mechanical keyboards. Listen now
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Let's divide the verse into two parts: נשאו נהרות ה'—נשאו נהרות קולם and ישאו נהרות דכים Each part is one sentence. The first one is broken up poetically by a caesura, around which both the subject and verb are repeated. So the reason "נשאו" and "נהרות" are identical in each of their appearances is simply that they are repetitions of the same word....


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I can only answer you first question. Grammatically, נשאו is past tense while ישאו is future tense.


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