- 비말은 비오일성(기름입자가 아님)이므�? 오일 성분�?차단능력은 크게 중요하지 않다. The 2 most common grammatical rules where by this occurs is when conjugating up to now or current tenses. For examples: If a grammatical theory which is additional to 서둘�?is really a vowel �?and there's no other