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What are the semantic effects of prefixing the particle لَنْ to a present tense verb?

Rule of Emphatic Negation in Future with "Lan" (لَنْ)

• It negates the past tense and makes it continuous
• It changes the meaning to emphatic future negation and restricts it to the future
• It changes the action into a wishful past
• It has no effect on the meaning