“لَ” (la)This prefix adds emphasis to the word or statement that follows.Corpus grammarEMPH — prefixed emph particle.
“تَرْكَبُ” (tarkabu)means “You will surely embark” in this verse. It is a verb. an action or state word. Here it is imperfect verb, second person — masculine — plural.Corpus grammarV — second person masculine plural imperfect verb.
“نَّ” (nna)This prefix adds emphasis to the word or statement that follows.Corpus grammarEMPH — emph particle.