Picking the right preposition can be tricky. After all, there are so many to choose from! But prepositions can be vital for building a grammatical sentence.
As such, you’ll need to know how these terms work if you want to avoid errors in your writing. And in this post, we’re taking a closer look at three common prepositions you need to know: “as,” “at,” and “by.”
Prepositions are linking words. In particular, they show us how a word is related to other words in a sentence. For example:
The man came from Scotland.
“From” here is a preposition that tells us the relationship between “man” and “Scotland” (i.e., that “Scotland” is where the man originated). Most prepositions work like this, coming before a noun or pronoun.
But how about the prepositions “as,” “at,” and “by”? What do we use these words for when building a sentence? Let’s take a look.
The word “as” has several uses. In fact, it isn’t even a preposition most of the time! Usually, it is either an adverb (when making comparisons) or a conjunction (when linking clauses).
However, it can also be a preposition. In this case, you would use it before a noun or noun phrase to express the function or character of something:
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Monique works as a proofreader.
Alan was difficult as a child.
In the first sentence above, for instance, “as” points to the type of work Monique does (i.e., proofreading). In the second, “as” tells us who Alan was when the speaker considered him difficult (i.e., a child).
The good news is that “at” is always a preposition, which is simpler than “as.” Unfortunately, it also has many uses as a preposition, so it is still tricky! We won’t try to list all its functions here, but key uses include indicating:
Most of the time, then, we use “at” to indicate a location, position, or state.
Finally, we have “by,” which is almost always a preposition. This term has many uses, but some of the most common include indicating:
As with “at,” the variety of uses here can seem confusing. But if you practice using the prepositions above, you should get the hang of them before long!
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