You may be confusing the words like and as with each other. Consider replacing one with the other. Let's learn their correct usage :- Like is most often used as a preposition to express a resemblance or sameness . (This perfume smells like roses) . When as is used as a preposition, it means “ in the role of. ” (I worked as a teacher for years.) Incorrect→ She looks as my friend Mona. Correct → She looks like my friend Mona . Incorrect→ I worked like a teacher for years. Correct→ I worked as a teacher for years.