The word “now” is primarily used as an adverb. It indicates the present time, serving to specify when something occurs.
For example, in the sentence “I am reading a book now,” the word “now” tells us that the action of reading is happening at this very moment. In addition to its role as an adverb, “now” can also function as a noun when referring to the present time, as in the phrase “We live in the now.” This versatility in its function makes “now” an interesting word in the English language.