When conveying a sense of certainty or importance, the phrase "be sure to" can often be replaced with a multitude of synonyms. Encouraging precision and attentiveness, synonyms like "make sure to", "ensure", and "guarantee" emphasize the necessity to complete a task. Phrases such as "don't forget to", "be certain to", and "take care to" offer a gentle reminder or a polite imperative. For a more insistent tone, alternatives like "be absolutely sure to", "insure" or "be unequivocal about" might serve better. Whatever the context may be, there are numerous ways to express the notion of ensuring that something is done with vigilance and attentiveness.