必(かなら)ず() kanarazu二(に) ni時(じ) jiに ni電(でん)話(わ) denwaして shiteください kudasai。 Please be sure to call at two o'clock. Literal Certainly two-o'clock [at-に] phone [polite-request-ください]. 必ず二時に電話してください — a specific-time instruction. に marks the exact time. schedulingphone calls~てください (polite request)
必(かなら)ず() kanarazu二(に) ni時(じ) jiに ni電(でん)話(わ) denwaして shiteください kudasai。 Please be sure to call at two o'clock. Literal Certainly two-o'clock [at-に] phone [polite-request-ください]. 必ず二時に電話してください — a specific-time instruction. に marks the exact time. schedulingphone calls~てください (polite request)