Moderator's Note: this following discussion is split from this thread. Your quoted sentence was "那个医生用药很特别" -> 用药 is a verb. Generic statement. "那个医生的用药很特别" -> 用药 is a noun. Generic statement. "那个医生的用药是很特别." -> This is a affirmative statement. It answers to question like "那个医生的用药很特别吗?" So at the end of the day, it really depends on the context or what was said before?