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Analyze the advanced syntactic structures, temporal alignment, and aspectual nuances in the following complex sentence containing multiple subordinate clauses and mixed time frames:"By the time the eminent climatologist completes his comprehensive decades-long research monograph on glacial recession next December, he will study environmental degradation across five continents for over forty years."Identify whether the underlined verb phrases require grammatical modification according to standard English tense-aspect rules.
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Detailed Explanation
In English grammar, when a time clause introduced by subordinating conjunctions like 'by the time', 'when', or 'before' refers to a future event, the verb in the dependent time clause takes the present simple tense ('completes'), whereas the main clause must employ the future perfect continuous tense ('will have been studying') to denote an action that will be in progress over a period of time up to a specific moment in the future. To understand the intricacies of time and aspect in English verbs, consult the Wikipedia Reference on grammatical tense and aspect.
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