This word is considered as a conjunction because it connects clauses in a sentence. Normally, it also means “while” or “when.” In the sample sentence below:
The dolphins popped up as we passed by.
The word “as” serves as a conjunction that connects the clause “the dolphins popped up” with the clause “we passed by.”
a. used to indicate that something happens during the time when something is taking place
- Peter watched her as she walked through the crowd.
b. used to indicate by comparison the way that something happens or is done
- They all felt as Dave did.
c. because; since
- I must prepare now as I have to go to school.
The word “as” is also commonly used as a preposition to indicate the time of being, or the role of a person or object. For instance, in this sentence:
Lisa had been stubborn as a teenager.
The word is categorized as a preposition because it is used to show the “time” (as a teenager) when the subject (Lisa) “had been stubborn.”
a. used to refer to the function or character that someone or something has.
- She got a job as a saleslady.
b. during the time of being
- Marco had often been sick as a child.
In some cases, the word “as” is also used to show comparison or equivalence. For example, in the sentence:
Her hair is as soft as silk.
The word is used to compare the noun “hair” with the noun “silk” in terms of the softness.
a. used in comparisons to refer to the extent or degree of something
- The sinkhole is as big as a basketball court.