temporary bivouac (bivouac)

Short answer: most "Is this correct?" questions fall into three buckets-wrong homophone, a punctuation join (comma splice or misplaced apostrophe), or a subject-verb mismatch. Find the category, run one quick test, then fix or rewrite.

Quick answer: Diagnose and fix a shaky sentence

Ask one of these three quick questions and use the fix beside it.

Does a short word sound right but look odd? (your/you're, its/it's, their/there/they're) → Expand the contraction or ask who owns it.
Is a comma joining two full thoughts? → Add a conjunction, use a semicolon, or split into two sentences.
Does the verb feel off? → Remove intervening phrases and match the verb to the true subject.

Core grammar: the quick tests that catch most errors

Use one simple substitution for homophones: expand contractions ("you're" → "you are"), replace "there" with "that place" if it's locational, or ask "who owns it?" for possessives ("their"/"your"/"its").

For commas: if both halves can stand alone, change the comma to a conjunction, semicolon, or period.

For verbs: strip away prepositional phrases and relative clauses, then match the verb to the remaining subject.

Homophone test: expand, substitute, or rephrase.
Comma test: Can each side be a sentence? If yes, fix the join.
Subject test: Remove extras (of..., who..., that...) and check number.

Examples: homophones and single-word traps

Wrong | Right: Wrong: Their going to announce the winners tomorrow.
Right: They're going to announce the winners tomorrow.
Wrong | Right: Wrong: Your welcome to join us.
Right: You're welcome to join us.
Wrong | Right: Wrong: Its been two hours.
Right: It's been two hours.
Wrong | Right: Wrong: The book is over their.
Right: The book is over there.
Wrong | Right: Wrong: This will effect the timeline.
Right: This will affect the timeline.
Wrong | Right: Wrong: She gave a loud compliment about the work (meant complement).
Right: She paid a compliment about the work. (or: She offered a complement.)
Wrong | Right: Wrong: I'd rather go then stay.
Right: I'd rather go than stay.
Wrong | Right: Wrong: He excepted the offer.
Right: He accepted the offer.
Wrong | Right: Wrong: Lay the book over there (when meaning 'recline').
Right: Lie down over there. (Or: Lay the book on the table.)

Punctuation pitfalls: comma splices and apostrophes (with rewrites)

Fix comma splices three ways: add a coordinating conjunction + comma, replace the comma with a semicolon, or split into two sentences. Use apostrophes only for possession or contractions-not plurals.

Comma splice pattern: "A, B." → "A, and B." OR "A; B." OR "A. B."
Apostrophes for ownership: "the dog's leash" (one dog), "the dogs' shelter" (many dogs).
No apostrophes for plurals: say "cars," not "car's" unless showing possession.

Wrong | Right: Wrong: I wanted to go to the movies, the show was sold out.
Right: I wanted to go to the movies, but the show was sold out.
Wrong | Right: Wrong: I sent the report, no reply yet.
Right: I sent the report; I haven't received a reply yet.
Wrong | Right: Wrong: The cat's are sleeping in the sun.
Right: The cats are sleeping in the sun.
Rewrite:
Original: "The team delivered the summary, however the client requested changes." Fixes: "The team delivered the summary; however, the client requested changes." or "The team delivered the summary. However, the client requested changes." or "The team delivered the summary, but the client requested changes."

Subject-verb agreement: find the true subject

Ignore modifiers between subject and verb. The verb must agree with the main noun. Indefinite pronouns (everyone, each) take singular verbs. Collective nouns (team, committee) can be singular or plural depending on whether the group acts as one unit or as individuals.

Remove extras: "The box of files is on the table." → subject = box → use "is".
Indefinite pronouns: "Everyone is ready."

Wrong | Right: Wrong: The team are meeting today.
Right: The team is meeting today. (if the group acts as one unit)
Wrong | Right: Wrong: Each of the students have a laptop.
Right: Each of the students has a laptop.
Wrong | Right: Wrong: My friends loves trying new restaurants.
Right: My friends love trying new restaurants.
Note: "The results, as well as the chart, were surprising." is correct because results = plural. Contrast with "The chart, as well as the results, was surprising." (chart = singular)

Hyphenation & spacing: small marks, big meaning

Hyphens join words when they act together as a modifier before a noun. Use one space after a period and the proper dash for ranges or emphasis based on your style.

Hyphenate before a noun: "well-known author" but not after the verb: "the author is well known."
Use a dash for ranges: "2018-2020" (en dash) and an em dash for emphasis depending on style; avoid extra spaces unless your style requires them.
Watch accidental splits: "re cover" vs "recover" change meaning; check auto-formatting.

Wrong | Right: Wrong: small business owner (ambiguous).
Right: small-business owner (owner of a small business).
Wrong | Right: Wrong: She is a well known scientist.
Right: She is a well-known scientist.
Wrong | Right: Wrong: 2018- 2020 results.
Right: 2018-2020 results.

Try your own sentence

Context matters. Test the whole sentence rather than a single phrase-often the right form becomes obvious when you read the sentence aloud or expand contractions.

How to fix your sentence: step-by-step templates and rewrites

Four-step edit: 1) Read the sentence aloud. 2) Identify the likely error type (homophone / punctuation / verb). 3) Apply the one-line fix. 4) If it's still unclear, rewrite using a simple subject + verb + object structure.

Comma-splice templates: "A; B." or "A, but B." or "A. B."
Possessive vs contraction: if "it is" fits, use "it's"; otherwise use "its".
Shorten to avoid errors: "they are" instead of "they're" until the meaning is clear.

Rewrite:
Original: "Their waiting for approval, the contract can't start." Fix: "They're waiting for approval, so the contract can't start." or "They are waiting for approval. The contract can't start yet."
Rewrite:
Original: "Your going to need more references." Fix: "You're going to need more references." or "You are going to need more references."
Rewrite:
Original: "I emailed him, he never responded." Fix: "I emailed him, but he never responded." or "I emailed him. He never responded."
Template (work): "I completed X; however, Y remains outstanding."
Template (school): "The [main subject] [verb] [object]." Cut modifiers if unsure: "The study shows a trend."

Real usage: workplace, school, and casual examples

Match your level of strictness to the context. Professional writing needs stricter punctuation and correct homophones. School work requires accuracy. Casual messages can relax rules, but keep meaning clear.

At work, prefer full forms and avoid comma splices and dangling modifiers.
In assignments, always use correct homophones and agreement; when in doubt, rewrite for clarity.
Casual messages: errors are forgiven, but "your" vs "you're" can flip the meaning of a compliment.

Work:
Wrong: "I sent the minutes, no feedback yet."
Right: "I sent the minutes; I haven't received feedback yet."
Work:
Wrong: "They're client approved the update."
Right: "Their client approved the update."
Work:
Wrong: "The committee have decided."
Right: "The committee has decided." (if acting as a unit)
School:
Wrong: "Its important to cite sources."
Right: "It's important to cite sources."
School:
Wrong: "She studied hard, she failed."
Right: "She studied hard, but she failed."
School:
Wrong: "Each student have an ID."
Right: "Each student has an ID."
Casual:
Wrong: "Your funny."
Right: "You're funny."
Casual:
Wrong: "There late to the party."
Right: "They're late to the party."
Casual:
Wrong: "Apple's on sale."
Right: "Apples are on sale."

Memory tricks

Short cues that stick.

THEY'RE = THEY ARE (try expanding it).
YOUR = YOU OWN; YOU'RE = YOU ARE.
IT'S = IT IS / IT HAS; ITS = possession.
Comma splice image: two complete houses connected by a single plank → add a stronger bridge (conjunction/semicolon) or build separate foundations (period).
Subject rule: strip the sentence to its skeleton (subject + verb) and check agreement.

Similar mistakes to watch for

Wrong | Right: Wrong: This will effect the outcome.
Right: This will affect the outcome.
Wrong | Right: Wrong: She took it as a compliment (meant complement).
Right: She took it as a complement.
Wrong | Right: Wrong: Fewer people showed up, there was less interest.
Right: Fewer people showed up; there was less interest.
Wrong | Right: Wrong: He than I am taller.
Right: He is taller than I am.
Wrong | Right: Wrong: Who did you give it to? (casual)
Right: To whom did you give it? (formal)
Usage: Lie vs. lay: "lie" = recline, "lay" = place something. Test tenses: past of lie = "lay"; past of lay = "laid".

FAQ

How do I remember when to use their, there, and they're?

Expand "they're" to "they are" to see if it fits. "There" points to a place. "Their" shows possession-ask "who owns it?" If one substitution reads naturally, it's the correct choice.

Is a comma splice always wrong in an email?

It's technically an error because it joins two independent clauses with only a comma. Informal chat often ignores it, but in professional emails avoid it-use a conjunction, semicolon, or period.

When should I use it's versus its?

Use "it's" only as a contraction for "it is" or "it has." Use "its" for possession. If "it is" works when expanded, keep the apostrophe.

How can I quickly fix subject-verb agreement mistakes?

Remove intervening phrases and match the verb to the main subject. For indefinite pronouns (everyone, each) use singular verbs. For collectives, decide if the group acts as one or many and be consistent.

Will grammar checkers catch all these errors?

They catch many issues and are useful, but they can miss context-based errors or suggest awkward rewrites. Use a checker, then apply the substitution tests above to confirm.

Want a second pair of eyes?

Paste a sentence you're unsure about into a checker (or here) and run the three quick tests: expand contractions, test comma independence, and isolate the subject. Paste your sentence and you'll get a direct rewrite plus a one-line rule explaining the change.