Replace 'wasn't' with 'was not'

Contractions shorten two words with an apostrophe (I'm, don't, it's). They suit speech, texts, and casual writing but can create errors: misplaced apostrophes, wrong homophones, or an inappropriate tone for formal contexts.

Below are clear rules, a repair kit of wrong→right pairs, copy-ready rewrites for work, school, and casual use, and a short checklist you can apply in 30 seconds.

Short answer

Use contractions in informal speech and everyday messages. Avoid them in academic papers, legal documents, formal reports, and anywhere clarity or authority is required. Always check apostrophes (it's = it is/has; its = possessive). If a contraction makes meaning ambiguous, expand it.

Formal → expand (do not, it is, we are).
Informal → contract (don't, they're, you're).
Apostrophe traps: it's vs its; your vs you're; their vs they're vs there; who's vs whose - test by expanding or replacing.

Core explanation: what contractions do and basic rules

Contractions replace omitted letters with an apostrophe (do + not = don't). They signal a conversational tone and mirror spoken language, but introduce two frequent problems: wrong apostrophes and wrong-word homophones.

Keep these rules tight: use contractions for an informal tone; expand for formal contexts; never use apostrophes to form regular plurals.

It's = it is / it has. Its = possessive. You're = you are. Your = possessive.
Contractions are stylistic: correctness depends on tone and clarity, not on grammar alone.
Apostrophes attach to letters (don't); never add spaces (do n't is wrong).

Real usage and tone: when contractions are OK - and when they're not

Use contractions for warmth, speed, or a conversational voice (texts, internal chat, personal blogs, dialogue). Expand when neutrality, formality, or strict style rules are required (academic work, legal text, formal reports).

If you're unsure, expand for external or formal audiences; keep contractions for internal, friendly, or narrative contexts.

Good to contract: Slack messages, internal updates, personal blogs, quoted dialogue.
Avoid contracting: journal abstracts, grant proposals, contracts, CVs unless guidance allows it.
When a contraction changes meaning (she'd = she had vs she would), expand or rephrase for clarity.

Work: "I'm finishing the draft now." (internal - fine)
School: "It is unclear whether..." (academic - expand)

Most common contraction mistakes (wrong → right repair kit)

Scan for patterns: its/it's, your/you're, their/they're/there, who's/whose, let's/lets, and contractions that hide tense or modality (she'd, he'd).

If expanding the contraction into two words fits the sentence, the apostrophe belongs. If expansion produces nonsense, you likely need a possessive or a different word.
If a contraction leaves tense or meaning ambiguous, expand and, if needed, reword.

Wrong: Its time to start the presentation.
Right: It's time to start the presentation.
Wrong: Your going to lead the demo, right?
Right: You're going to lead the demo, right?
Wrong: Their not ready to switch environments.
Right: They're not ready to switch environments. / There are no switches available.
Wrong: Heres the updated report.
Right: Here's the updated report.
Wrong: Who's keys are on the desk?
Right: Whose keys are on the desk?
Wrong: We should of included that variable.
Right: We should have included that variable.
Wrong: Lets review the findings at 3.
Right: Let's review the findings at 3.
Wrong: She'd go if she had the time. (ambiguous)
Right: She would go if she had the time. / She had already left.

Examples: quick mixed-context fixes you can copy

Short swaps you can use immediately to polish a sentence for the intended audience.

Work (formal): Wrong: "I'm sending the contract tonight." →
Right: "I will send the contract tonight."
School (academic): Wrong: "It's clear that the method failed." →
Right: "It is evident that the method failed."
Casual:
Wrong: "Cant wait to see you!" →
Right: "Can't wait to see you!"
Neutral: Wrong: "Their going to post the update." →
Right: "They're going to post the update."
Clarity: Wrong: "She'd finished the work." →
Right: "She had finished the work."

Work examples: emails, reports, and client-facing rewrites

Contract in short, internal notes. For client or executive-facing writing, expand or rephrase to increase formality and precision.

Short chats → contract. External reports → expand or rephrase for formality.
When you expand, check tone: "I can't" → "I am unable to" or "I cannot" depending on politeness and strength.

Wrong: I can't get the server to respond; the logs are empty.
Right: I cannot get the server to respond; the logs are empty.
Wrong: We're launching the beta next Friday - hope you can join.
Right: We are launching the beta next Friday. Please let us know if you can attend.
Wrong: If you're free, let's discuss the timelines.
Right: If you are available, let us schedule a discussion about the timelines.
Wrong: Here's the budget - we've cut discretionary spend.
Right: Attached is the budget; we have reduced discretionary spending.

Try your own sentence

Test the full sentence instead of a single phrase: context usually makes the correct choice obvious.

School examples: essays, lab reports, and formal student writing

Professors typically prefer expanded forms for an objective tone. If you quote a contraction, keep the quote but write your analysis formally.

Expand contractions in abstracts, introductions, and formal argumentation.
Reflective or narrative assignments may allow some contractions-check instructor guidance.

Wrong: It's important to note the sample bias in this survey.
Right: It is important to note the sample bias in this survey.
Wrong: You shouldn't ignore the control variables when drawing conclusions.
Right: One should not ignore the control variables when drawing conclusions.
Wrong: We're going to compare three data sets in section 2.
Right: We will compare three data sets in Section 2.
Wrong: They've shown a correlation but not causation.
Right: They have demonstrated a correlation but not causation.

Casual examples: texts, social posts, and dialogue

Contractions make short messages natural. Misspelled contractions still look careless-fix apostrophes even in casual posts.

Contractions for short messages: I'll, we're, she'll.
Avoid slang spellings (gonna, wanna) in written content unless intentionally stylistic.

Wrong: Cant wait for tonight, its going to be fun!
Right: Can't wait for tonight - it's going to be fun!
Wrong: Youre kidding, right? Thats insane.
Right: You're kidding, right? That's insane.
Wrong: Gonna grab food, dont wait up.
Right: Gonna grab food - don't wait up. (or) I'm going to grab food; don't wait up.
Wrong: Whos bringing dessert?
Right: Who's bringing dessert?

How to rewrite and fix your sentence: a fast editing checklist + templates

Follow this mini-process whenever a contraction feels wrong: identify, expand, evaluate tone, and adjust wording. Use the templates below to swap tones quickly.

Step 1: Identify the contraction (e.g., it's). Step 2: Expand it (it is / it has). Step 3: If the audience is formal, keep expansion. Step 4: Check homophones and apostrophes.
If expansion remains ambiguous, replace with an explicit verb (had, would, will, cannot).

Casual → Formal: "I'll send the files later." → "I will send the files later today."
Casual → Academic: "She's right about the costs." → "She is correct in identifying the primary cost drivers."
Casual → Neutral professional: "You can't submit late work." → "Late submissions cannot be accepted."
Ambiguous contraction: "He'd left before we arrived." → "He had left before we arrived."
Tone swap: "We're thrilled to announce" → "We are pleased to announce" → "The team will announce"
Polite professional template: "I'm writing to ask" → "I am writing to request" / "I would like to request"

Memory tricks, hyphenation/spacing, and related grammar checks

Quick mnemonics and micro-rules help spot and fix errors fast.

Expand test: If expansion into two words makes sense, the apostrophe belongs (it's → it is).
Possessive test: Replace the noun with "the dog" or "the company." If that fits, use the possessive (its / the company's).
Spacing: apostrophes attach to letters (don't). Never write spaces around apostrophes (do n't or it 's are wrong).
Hyphenation: contractions are not hyphenated. Use hyphens for compound adjectives (well-known author), not for contractions.
Ambiguity check: she'd, he'd, you'd can mean two things-expand and, if still unclear, rephrase to "she had" or "she would."

Wrong: Do n't worry about it.
Right: Don't worry about it.
Wrong: The CEO's report covers 2020 - 2021's results.
Right: The CEO's report covers 2020-2021 results. (use an en dash for ranges; avoid apostrophes for plurals)

Similar mistakes and next steps

After fixing contractions, scan for possessive apostrophes, pluralization errors, homophones, and omitted auxiliaries-these errors often appear together.

Common clusters: its vs it's; your vs you're; their vs they're vs there; who's vs whose; plural apostrophe misuse (1990s not 1990's).
Simple editing routine: write → wait 5-10 minutes → read aloud → expand doubtful contractions → run a grammar check → choose the version that fits your audience.
For a second opinion, paste a sentence into a grammar tool to see suggested expansions; then decide based on tone.

Usage: Possessive vs contraction: "The students' feedback" vs "Students' feedback is in; it's ready."
Usage: Plural vs possessive: "Teachers lounge" (ambiguous) → "Teachers' lounge" or rephrase to "the faculty lounge" for clarity.

FAQ

Should I use contractions in a college essay?

Default to full forms (it is, do not) for formal essays unless the assignment allows a conversational voice or you quote dialogue.

Is it wrong to use contractions in a business email?

Not always. Use contractions for internal, friendly emails. For client-facing proposals, formal updates, or legal documents, expand contractions for precision and a professional tone.

How do I know when to use its vs it's?

Try expanding: if you can replace it's with it is or it has and the sentence still makes sense, use it's. If the meaning is possession, use its.

What's the difference between who's and whose?

Who's = who is / who has (contraction). Whose = possessive. Expand who's to who is-if that fits, it's correct.

Can grammar checkers catch all contraction mistakes?

They catch many typos and common homophone errors but can't always judge tone or ambiguous meanings. Use a checker to find problems, then apply human judgment about formality and clarity.

Need help deciding?

If you're unsure, expand the contraction and read the sentence aloud. If the expansion fits your audience, keep it; if it sounds too stiff, try a clearer rephrase.

For a quick second opinion, paste the sentence into a grammar tool to see suggested expansions and short explanations, then choose the version that matches your tone and audience.