Choose the sentence that uses the future perfect continuous tense correctly according to the rules of standard written English syntax.
Answer और ExplanationAnswer and explanation
Answer: (A) By next autumn, the computational linguistics group will have been developing the neural translation framework for three full years.
नोट: उत्तर कुंजी (answer key) में विकल्प (d) दिया गया है, परन्तु व्याख्या के अनुसार सही वाक्य विकल्प (a) है। विकल्प (d) गलत है, क्योंकि 'know' एक Stative Verb है।
Concept (Stative Verb के साथ Future Perfect Continuous): संरचना है will have been + V-ing, और अवधि 'for' या 'since' से बताई जाती है। विकल्प (a) 'will have been developing ... for three full years' में संरचना और अवधि दोनों सही हैं।
(b) में 'until the library closes' बिंदु बताता है, अवधि नहीं, और अर्थ अस्वाभाविक है। (c) में 'When' वाले time clause (समय उपवाक्य) में 'will' नहीं आता; वहाँ Present Simple 'commences' आएगा। (d) में 'will have been knowing' गलत है, क्योंकि 'know' Stative Verb है और Continuous रूप में प्रयुक्त नहीं होता।
Examiner का trap 'will have been knowing' जैसे Stative Verb के Continuous रूप को सामान्य रचना मान लेना है।
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Note: the answer key gives option (d), but the explanation identifies option (a) as the correct sentence. Option (d) is wrong because 'know' is a stative verb.
Concept (Future Perfect Continuous with Stative Verb): the structure is will have been + V-ing, and a duration is shown with 'for' or 'since'. Option (a), 'will have been developing ... for three full years', has both the correct structure and the duration.
Option (b) uses 'until the library closes', which gives a point rather than a duration, and the sense is unnatural. Option (c) is wrong, because a 'when' time clause does not take 'will'; the present simple 'commences' is needed. Option (d), 'will have been knowing', is wrong, because 'know' is a stative verb and is not used in the continuous form.
Exam trap: accepting a continuous form of a stative verb, such as 'will have been knowing', as a normal construction.
Source: DSSSB ASO 2026 · 29 Sep 2026 · Shift II। Solution: Prashant Sir, Ramban।Source: DSSSB ASO 2026 · 29 Sep 2026 · Shift II. Solution by Prashant Sir, from Ramban.