As vs. because vs. since: When to use them
Published on November 21, 2022 / Updated on January 3, 2024
As vs. because vs. since: They’re all part of a group of words called causal conjunctions. Their job is to introduce subordinate clauses and connect a reason to a result in a sentence.
That means you can use them all the same way, right?
Well, kind of, but not exactly.
Despite the fact that these words have similar jobs in sentences that are seemingly alike, they’re not identical. If you’re an English learner, you know that this can be the source of a lot of confusion. How do you know when to use “since,” “as” or “because” to ensure you have correct grammar?
Don’t worry—we’re going to clear a few things up for you. Let’s discuss the differences between these conjunctions and how to use each one.
The causal conjunction “because” is the most common and informal of the three conjunctions we’re discussing—and probably the least confusing too. Its typical form is because + subject + verb.
Here are some of its main features:
Example: “He was late for work today because there was a lot of traffic.”
The purpose of the sentence is to provide a reason for his lateness.
Example: A sentence like “I can’t come to the party because I’m sick” is a little more natural than “Because I’m sick, I can’t come to the party.”
Example: “Because our fundraiser was such a success, we can now afford to
renovate the school gymnasium.”
Example: “Are you going to take a vacation because you’re so stressed out?”
Example: Speaker 1: “Why do you look so sad today?” Speaker 2: “Because my best friend just moved to another country.”
Example: I’ve been shopping much less often because of the price of groceries.”
Although they’re not identical, “as” and “since” are used similarly, so we’re going to look at them together. These two conjunctions are both more formal than “because” and are slightly less strong when it comes to making a link between a reason and a result. Their form is as/since + subject + verb.
Here are a few more details:
Example: “My daughter is unhappy at school as her teacher is unkind to her.”
The purpose of the sentence is to highlight that your daughter is unhappy at school, which is the result of her teacher being unkind.
Example: “We’re looking for a house since we’ve outgrown our apartment.”
The focus here is on trying to find a house—the result of having an apartment that’s too small.
Example: “As I have an appointment this afternoon, I won’t be available to work.”
Example: “Since Christmas is next month, I need to start buying some gifts!”
Example: “He’s been in a good mood since he quit his job.”
Here’s why that sentence is confusing: It’s unclear whether this means “He’s been in a good mood from the moment he quit his job up until the present time” or “He’s been in a good mood because he quit his job.”
Example: “She smiled as she was eating her favorite meal.”
Does this mean that she smiled while she was eating her favorite meal, or because she was eating her favorite meal?
If you find that your sentence might be misinterpreted like the above examples, try rewording it so there’s no room for misunderstanding.
Although we’ve gone through the key features of these causal conjunctions, the truth is that the differences between them are sometimes not very obvious. To get a good grasp of this topic, review the information above, try putting it into practice whenever possible and, whenever you’re in doubt, using “because” is a pretty safe bet!