Subordinating Conjunctions of Reason: The Complete Guide to Explaining “Why” in Clear, Natural English

If you want to explain why something happens, you need subordinating conjunctions of reason. These small but powerful words connect a cause to its effect and help readers follow your thinking with ease. Master them, and your writing becomes clearer, more persuasive, and more professional—whether you’re drafting emails, essays, reports, or blog posts.

What is a subordinating conjunction of reason?
– A subordinating conjunction of reason introduces a dependent clause that explains the cause of the main clause. In simple terms, it tells readers why the main action happened.
– Example: I closed the window because the room was cold.
• Main clause: I closed the window.
• Reason clause: because the room was cold.

Core conjunctions of reason (with nuance and examples)
1) because (neutral, direct)
– Use it when you want a strong, explicit cause-and-effect link.
– Examples:
• We canceled the picnic because it started to pour.
• She’s applying early because the scholarship deadline is tight.

2) since (reason or time—check for ambiguity)
– Since can mean “because,” but it can also signal time (“from then until now”). Use it for softer, background reasons, and watch out for confusion.
– Examples:
• Since the data were incomplete, the team delayed publication. (reason)
• I’ve worked remotely since 2020. (time)

3) as (formal, potentially ambiguous)
– As can signal cause, time, or comparison. Use it for formal writing, but prefer because if there’s any chance of confusion.
– Examples:
• As the roads were icy, classes moved online. (reason)
• As I was leaving, the phone rang. (time)

4) now that (change in circumstances)
– Use it when a new situation explains a decision or result.
– Examples:
• Now that the feature is live, we can start user onboarding.
• Now that he’s turned 18, he can vote in the election.

5) given that (factual basis or assumption)
– Common in academic, business, and legal contexts when you’re highlighting a known condition or premise.
– Examples:
• Given that margins have narrowed, the board is revising forecasts.
• Given that the sample size is small, interpret results cautiously.

6) considering (that) (weighing factors, hedged)
– Informal to neutral; useful when you want to acknowledge a reason without overstating it.
– Examples:
• Considering (that) it was her first marathon, her time was impressive.
• Considering the traffic, arriving only five minutes late was a win.

7) seeing that (informal, conversational)
– Sounds casual and judgment-based; good for dialogue and everyday writing.
– Examples:
• Seeing that you’ve finished early, take the rest of the day off.
• We should order in, seeing that everyone’s exhausted.

8) inasmuch as / in that (very formal, legalistic)
– Best reserved for legal, policy, or highly formal contexts.
– Examples:
• The claim is dismissed, inasmuch as the filing was late.
• The method differs from previous work in that it uses synthetic data.

9) for (literary/old-fashioned as “because”)
– Not the same as the preposition for. As a conjunction meaning “because,” it sounds literary; avoid in modern business or academic prose.
– Example:
• We left early, for the storm was intensifying. (formal/literary)

Reason vs. purpose vs. result
– Reason (why something happened): because, since, as, now that, given that…
• We stayed inside because it was hailing.
– Purpose (what you intend to achieve): so that, in order that.
• We stayed inside so that the equipment wouldn’t get damaged. (goal)
– Result (what happened afterward): so, therefore, as a result (these are not subordinating conjunctions of reason).
• It hailed; as a result, the game was canceled.

Because vs. because of (and other prepositional alternatives)
– because + clause: We left because the road was closed.
– because of + noun/gerund: We left because of the road closure / because of the road being closed.
– Other prepositional options (useful for variety and concision): due to, owing to, thanks to, on account of.
• Due to severe winds, flights were grounded.
• Owing to budget cuts, hiring is paused.
• Thanks to an early start, we finished by noon.
• On account of the outage, the release was delayed.
– Tip: In careful formal prose, due to most naturally follows a form of be (The delay was due to…); in everyday business English, it’s widely used sentence-initially. Your house style may vary.

Positioning and punctuation
– If the reason clause comes first, use a comma:
• Because the server crashed, we rolled back the deployment.
• Given that enrollment is up, the department will add a section.
– If the main clause comes first, you usually don’t need a comma:
• We rolled back the deployment because the server crashed.
• The department will add a section given that enrollment is up.
– Exception—use a comma when the reason is nonessential, contrasting, or especially long:
• We’re keeping the pilot, because, frankly, the results were outstanding.
• We extended hours, as the holiday rush is unusually heavy this year.

Register and tone: pick the right tool
– Clear and neutral: because, now that.
– Slightly softer/assumptive: since, as.
– Formal/analytical: given that, in that.
– Conversational: seeing that, considering (that).
– Very formal/legal: inasmuch as.

Common pitfalls (and how to fix them)
1) Fragment with because
– Incorrect: Because the deadline moved.
– Fix: Because the deadline moved, we’re accelerating testing. OR We’re accelerating testing because the deadline moved.

2) Ambiguity with since or as
– Ambiguous: Since we finished, we relaxed. (time or reason?)
– Clear: Because we finished, we relaxed. (reason)
– Clear: Ever since we finished, we’ve been relaxing. (time)

3) Confusing reason and purpose
– Incorrect for purpose: We tested twice because to confirm the fix.
– Fix (purpose): We tested twice so that we could confirm the fix. OR We tested twice to confirm the fix.

4) Overusing formal options
– Wordy: Inasmuch as the report is delayed, we’re postponing the review.
– Better: Because the report is delayed, we’re postponing the review.

5) Misplacing commas
– Over-comma: We’re leaving, because the roads are icy.
– Better (essential reason): We’re leaving because the roads are icy.
– Okay when adding emphasis or an aside: We’re leaving, because, honestly, the roads are icy.

6) Mixing up because and because of
– Incorrect: Because of the roads are icy, we’re leaving.
– Fix: Because the roads are icy, we’re leaving. OR Because of the icy roads, we’re leaving.

High-impact examples by context
– Everyday: I wore boots because the sidewalks were slushy.
– Academic: Given that prior studies are inconclusive, replication is necessary.
– Business: Now that revenue is stabilizing, we can reinvest in R&D.
– Technical: Since the API is rate-limited, batch requests where possible.
– Legal/formal: The agreement is void inasmuch as it contravenes statute.

How to choose the best conjunction (a quick decision guide)
– If clarity is your top goal, default to because.
– If the reason is background information, and ambiguity won’t arise, since or as can soften tone.
– If a new condition explains the decision, use now that.
– If you’re highlighting a premise or widely accepted fact, choose given that.
– If your audience is general or global, avoid very formal (inasmuch as) or literary (for) options.

Practical tips you can use today
– Read for ambiguity: If since or as could be read as time instead of cause, switch to because.
– Test the swap: Replace your conjunction with because. If the sentence still reads smoothly and your meaning holds, your original choice likely works too.
– Move the clause: Put the reason clause first to emphasize the cause; put it second to emphasize the result.
– Keep it concise: Prefer because over long, formal alternatives unless you need the nuance (e.g., given that in academic writing).
– Mind your audience: For cross-functional business docs and consumer-facing content, choose the clearest, most natural option.
– Vary rhythm, not meaning: Rotate between because and prepositional phrases (because of, due to, owing to) to avoid repetition without changing sense.
– Proof for completeness: If your sentence starts with a reason word, make sure a full main clause follows—it’s easy to leave a fragment in drafts.

Mini practice (with answers)
A) Fill in the blank with a conjunction of reason that fits the tone.
1) ______ the forecast has improved, we’re lifting the spending freeze.
2) We’ll wait for QA sign-off ______ we need to meet compliance requirements.
3) ______ the study’s methodology differs from prior work, results aren’t directly comparable.
4) They closed the trail ______ a bear was spotted nearby.
5) ______ it’s rush hour, let’s take the earlier train.

Suggested answers:
1) Now that / Given that
2) because
3) in that / given that
4) because
5) Since (if context is reason), Because (safest for clarity)

SEO and readability checklist for writers and editors
– Use because where clarity matters most; reserve formal variants for specific nuance.
– Front-load the reason clause for stronger hooks in intros and leads.
– Avoid stacking multiple reason clauses; split long sentences for skimmability.
– Keep paragraphs short (2–4 sentences) and use examples to anchor abstract rules.
– When localizing content, prefer because over as/since to minimize misreadings by non-native readers.

Stronger conclusion: make reasons work for you
Subordinating conjunctions of reason are the backbone of clear explanations. They don’t just connect clauses; they guide your reader through your logic. Default to because for straightforward, unmistakable cause-and-effect. Reach for since or as when you want a lighter touch and no ambiguity. Choose now that and given that to underscore new conditions or shared premises. Save the heavy formal options for contexts that demand them.

If you apply the tips above—checking for ambiguity, choosing the right tone, positioning clauses for emphasis, and keeping punctuation clean—you’ll write reasons that are concise, precise, and persuasive. Start by revising a recent paragraph: swap any unclear since or as for because, move one reason clause to the front for impact, and trim any bloated formal phrasing. In a few minutes, your writing will read cleaner and carry more authority—because your reasons will be impossible to miss.