Language Tool (LanguageTool)

Focus on five high-impact checks: apostrophes, homophones, subject-verb agreement, run-ons (plus spacing and hyphenation), and pronoun case. These catch most visible mistakes fast.

Below: short diagnostics, copy-ready rewrites, workplace/school/casual examples, simple memory tricks, and a three-step repair routine you can paste into drafts.

Quick fix: five things to check first

Scan for: wrong apostrophes (possession vs contraction), confused homophones, subject/verb mismatch, clauses joined incorrectly, and wrong pronoun case. Run these checks before you hit send to clear most obvious errors.

Apostrophes: possession or contraction only - never for plurals.
Homophones: meaning decides the spelling (your/you're; their/there/they're).
Agreement: verb matches the grammatical subject, not a nearby noun.
Run-ons: join clauses with comma + conjunction, semicolon, or split into sentences.
Pronouns: use I/he/she/we/they as subjects and me/him/her/us/them as objects.

Core explanation and real usage

These errors are common because they're quick surface checks that writers miss when composing fast. Fixing them improves clarity and tone immediately.

Casual speech often relaxes some rules; for emails, reports, and assignments, favor the stricter forms so readers focus on your ideas, not errors.

Before sending: check apostrophes, homophones, agreement, clause joins, and pronoun case.
Match register: formal for clients and professors, neutral for colleagues, relaxed for friends.

Apostrophes: possession vs contraction (and never for plurals)

Test apostrophes by expanding: if a phrase expands to "it is" or "it has", use an apostrophe (it's). For possession, use its for possessive without apostrophe only when appropriate; singular possessive uses apostrophe+s (dog's). Avoid apostrophes for plurals (CDs, not CD's).

If you can expand to "it is" or "it has", write it's; otherwise use its (possessive).
When unsure, rewrite with "of" (the cover of the book) to avoid awkward apostrophes.

Wrong: The dog's are barking.
Right: The dogs are barking.
Wrong: Its been a long week.
Right: It's been a long week.
Wrong: CD's were handed out.
Right: CDs were handed out.
Rewrite: The cover of the book tore. (Instead of: The book's cover tore.)

Homophones and confusables: pick meaning, not sound

Short words that sound the same-your/you're, their/there/they're, to/too/two-are easy to miswrite. Ask which meaning you need, then spell it.

Substitute a longer phrase to test: "you are" → you're; "in that place" → there; "belonging to them" → their.

Substitute to check: can I write "you are"? then use you're. If it's a place, use there.
Watch lookalikes that aren't homophones but cause errors: affect/effect, fewer/less, lie/lay.

Wrong: They're going to there house after work.
Right: They're going to their house after work.
Wrong: I left my stationary on the desk.
Right: I left my stationery on the desk.
Wrong: I ate too much desert.
Right: I ate too much dessert.
Wrong: Please advise on the affect of this change.
Right: Please advise on the effect of this change.

Subject-verb agreement: find the true subject

The verb agrees with the grammatical subject. Ignore intervening phrases like "along with" or "including" when choosing the verb.

Collective nouns (team, committee, data) can be treated as singular or plural depending on meaning-match your audience or style guide.

Tip: remove modifiers to reveal the core subject + verb (The list is..., not The list are...).
Compound subjects joined by and take plural verbs; or/nor follow the nearest subject.

Wrong: The list of attendees are on the table.
Right: The list of attendees is on the table.
Wrong: My favorite part of the reports were the charts.
Right: My favorite part of the reports was the charts.
Wrong: The committee have sent their response.
Right: The committee has sent its response.
Work: In sciences you may see "data are"; in general prose "data is" is common-follow your field.

Run-ons, comma splices, spacing, and hyphenation

Run-ons and comma splices join independent clauses improperly. Fix them with a comma + coordinating conjunction (and, but, so), a semicolon, or by splitting into two sentences.

Use one space after a period (modern convention). Hyphenate compound adjectives before a noun (high-quality report) and drop the hyphen when the modifier follows the noun.

Fix options: add "and/but/so" with a comma, use a semicolon, or make two sentences.
Hyphenate compound modifiers before a noun for clarity; drop the hyphen when the modifier follows the noun.

Wrong: I like to hike I enjoy being surrounded by nature.
Right: I like to hike, and I enjoy being surrounded by nature.
Wrong: She ran to catch the bus, she missed it.
Right: She ran to catch the bus, but she missed it.
Wrong: We need a high quality report.
Right: We need a high-quality report.
Rewrite: Split long clauses: I finished the analysis. I will send it by noon.

Try your own sentence

Test a whole sentence in context-context usually makes the right choice clearer than isolated phrases.

Pronouns and case: I vs me, who vs whom

Use subjective pronouns (I, he, she, we, they) as subjects and objective pronouns (me, him, her, us, them) as objects. Put others first when listing people (Jane and I).

For who vs whom: replace with he/she (who) or him/her (whom). If "him" fits, use "whom."

Quick test: remove the other person-"John and I" becomes "I" (correct), not "me."
Who = subject; whom = object. Use "to whom" in formal contexts when appropriate.

Wrong: Me and John will present tomorrow.
Right: John and I will present tomorrow.
Wrong: Give the notes to Sarah and I.
Right: Give the notes to Sarah and me.
Wrong: Who did you invite to the meeting?
Right: Whom did you invite to the meeting?
School: Use "whom" in formal writing when it functions as an object: "To whom should I address the letter?"

Memory tricks and quick rules you'll actually use

Make these one-line tests part of your proofreading routine so you catch errors without digging into grammar books.

Practice three quick moves: expand, substitute, strip.

Expand: Turn it's into "it is" or "it has" to test apostrophe use.
Substitute: Replace you're with "you are" or who/whom with he/him to test meaning and case.
Strip: Remove modifying phrases to find the true subject for agreement.

Three-second rule: Pause 3 seconds and run expand/substitute/strip before sending important messages.
Quick rewrite trick: If "of the" reads better, use it (the cover of the book) instead of wrestling with apostrophes.

Examples and ready-to-paste rewrites (work, school, casual)

Practical examples across contexts. Each wrong sentence is paired with a corrected line you can paste into an email, assignment, or message.

Work - Wrong: The team's meeting are scheduled for Friday.
Work - Right: The team's meeting is scheduled for Friday.
Work - Wrong: Please find attached the report's conclusions.
Work - Right: Please find the report's conclusions attached.
Work - Wrong: I will submit the updates tomorow.
Work - Right: I will submit the updates tomorrow.
School - Wrong: The data shows that the hypothesis was correct.
School - Right: The data show that the hypothesis was correct.
School - Wrong: Me and my lab partner recorded the results.
School - Right: My lab partner and I recorded the results.
School - Wrong: Its important to control variables.
School - Right: It's important to control variables.
Casual - Wrong: Your gonna love this movie.
Casual - Right: You're gonna love this movie.
Casual - Wrong: Meet me their at 7?
Casual - Right: Meet me there at 7?
Casual - Wrong: I need to loose weight.
Casual - Right: I need to lose weight.
Rewrite: "Due to the fact that" → "Because" (shorter and clearer).
Rewrite: "There is many reasons" → "There are many reasons" (match subject/verb).
Rewrite: "Me and Jane will review" → "Jane and I will review" (correct pronoun case).
Rewrite: "It's issues with the server" → "There are issues with the server" (clarity + correctness).

Rewrite help: a short workshop and similar mistakes to watch

Repair checklist: 1) Read aloud to find pauses; 2) Expand/substitute (it's → it is; you're → you are; he/him for who/whom); 3) Strip modifiers to check agreement; 4) Fix clause joins by splitting or adding proper punctuation.

Below are three reader sentences, a diagnosis, and clean rewrites you can copy verbatim.

Wrong: The committee have sent it's recommendations but no one read them.
Rewrite: The committee has sent its recommendations, but no one has read them.
Wrong: I finished the report, I hope you like it.
Rewrite: I finished the report. I hope you like it.
Wrong: Can you email John and I the files?
Rewrite: Can you email John and me the files?
Similar mistakes: affect/effect, lay/lie, fewer/less, complement/compliment-check meaning, not sound.

FAQ

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

Expand the form: if "it is" or "it has" fits, use it's. If the sense is possessive (belonging to it), use its.

Why does my grammar checker flag "data are" - which is correct?

Style varies: sciences often use "data are" (plural); general prose treats data as a mass noun ("data is"). Match your field or publication guide.

What's the fastest way to fix a run-on sentence?

Add a comma + coordinating conjunction (and, but), use a semicolon, or split into two sentences. Read aloud to hear the natural pause and choose the fix that keeps flow.

Should I hyphenate compound modifiers?

Yes, hyphenate compound adjectives before nouns for clarity (a well-written plan). Drop the hyphen when the modifier follows the noun (the plan is well written).

How can I quickly check my sentence for these common errors?

Run the four-step check: read aloud, expand/substitute suspect words, strip modifiers to test agreement, and confirm clauses are properly joined. For a second opinion, paste a single sentence into a grammar tool and compare suggested rewrites.

Try fixing one sentence now

Pick one sentence you wrote, apply the four-step check above, and replace any flagged fragment with the rewrite patterns shown here. Small edits often improve both clarity and tone.

For a quick second opinion, paste one sentence into a grammar tool and compare the suggested rewrite to your original to spot easy improvements.