let's (lets)

One tiny apostrophe changes the meaning: lets (no apostrophe) is a third-person singular verb (he/she/it lets); let's (with apostrophe) is the contraction of 'let us' used for suggestions that include the speaker.

Quick answer: which is correct?

Use lets (no apostrophe) when a third person or a singular noun gives permission or causes an action. Use let's (with apostrophe) when you mean "let us"-a suggestion or invitation that includes the speaker.

lets = present-tense verb for he/she/it or a singular noun (no apostrophe)
let's = contraction of 'let us' (used for suggestions or invitations including the speaker)
Quick test: expand let's to "let us". If the sentence still makes sense, the apostrophe belongs.

Core explanation: the grammar in one paragraph

lets (no apostrophe) is the simple present verb used with third-person singular subjects: "She lets her dog off the leash." Let's is a contraction of "let us" used to propose action that includes the speaker: "Let's review the draft." They sound identical when spoken, so check structure in writing.

If the sentence is a proposal that includes you, use let's.
If the sentence reports permission, habit, or a third-party action, use lets.

Real usage and tone: work, school, and casual examples

Let's is conversational and common in meetings, classes, and texts. For formal writing, replace let's with "let us" or another phrasing. Lets reports permission or habitual actions done by someone else.

Work: Let's kick off with a five-minute update. (invitation that includes the speaker)
Work: She lets contractors into the office after checking IDs. (permission by a third person)
Work (formal): Please begin the report at 9:00. (avoid contractions in formal memos)
School: Let's review the rubric before we submit. (group suggestion)
School: The teacher lets one student present per class. (permission/habit)
School (formal): We should complete the survey by Friday. (formal alternative)
Casual: Let's grab tacos after class. (friends inviting each other)
Casual: He lets his phone die every night-habitual action.
Casual (typo watch): "Let s" is wrong-keep the apostrophe tight: "let's."

Examples: common wrong/right pairs (copyable)

Common mistaken forms followed by the correct version. Each wrong sentence shows the typical apostrophe error.

Wrong: Lets finalize the report before the 2pm call.
Right: Let's finalize the report before the 2pm call.
Wrong: The lead scientist let's the intern handle the samples alone.
Right: The lead scientist lets the intern handle the samples alone.
Wrong: Students lets meet in the library after class.
Right: Students, let's meet in the library after class.
Wrong: Lets study for the chemistry test tonight.
Right: Let's study for the chemistry test tonight.
Wrong: Lets grab coffee later.
Right: Let's grab coffee later.
Wrong: He let's his dog off the leash every morning.
Right: He lets his dog off the leash every morning.

Rewrite help: three quick rewrite formulas (with examples)

When you're unsure, rephrase. Small changes remove ambiguity and adjust tone.

If let's feels too casual, replace with "We should" or "Please" for formality. Example: "Let's not forget the deadline." → "Please remember the deadline."
If the sentence is about permission, use "allows" or "permits" instead of lets for clarity. Example: "She lets students choose topics." → "She allows students to choose topics."
If you're unsure about the apostrophe, rewrite without let. Example: "Let's make this official." → "We should finalize this now."

Fix your own sentence: a short checklist (3 quick steps)

Use these three quick checks whenever you spot lets/let's.

Step 1 - Expand: Replace "let's" with "let us". If it still makes sense, use let's.
Step 2 - Identify the subject: Is the subject a third-person singular doing the action? If so, use lets (no apostrophe).
Step 3 - Rephrase for tone: For formal writing, avoid the contraction and use "let us", "we should", or "please".

Applied: "The committee lets begin the presentation." → Expand test: "The committee let us begin..." (no). Subject = committee; the sentence is a suggestion, so correct form is: "Let's begin the presentation." Formal: "Please begin the presentation."

Try your own sentence

Test the whole sentence in context. Context makes the correct choice obvious far more often than inspecting the word alone.

Memory trick: fast mnemonics that stick

Short, repeatable tricks beat rules when you write fast. Pick one that clicks:

Apostrophe = 'us': let's = let us. If "let us" sounds right, use the apostrophe.
No apostrophe = third-person verb: she lets, he lets, the manager lets.
Visual: imagine the apostrophe as the compressed "us"-it stands for "us."

Practice: Replace "Let's" with "Let us" in your head. If it fits, the apostrophe belongs.

Hyphenation, spacing and punctuation matters

Common typographic errors are typing "lets" when you meant "let's" or inserting a space as "let s". Make sure the apostrophe sits directly between t and s with no spaces.

Correct: "Let's start."
Wrong: "Let s start" or "Lets start" (if a suggestion).
When quoting, the apostrophe stays inside the quotation marks: He said, "Let's begin."
Watch autocorrect and mobile keyboards that drop apostrophes.

Wrong: Let s start the meeting now.
Right: Let's start the meeting now.

Grammar details: third-person lets vs contraction let's

lets (no apostrophe): present simple verb for third-person singular subjects (he/she/it or a singular noun). Example: "The coach lets the team practice late."

let's (with apostrophe): contraction of "let us" used for suggestions or invitations that include the speaker. Example: "Let's revise the plan together."

Don't add an apostrophe to third-person verbs.
Use "let us" instead of "let's" in formal writing, or rephrase to "we should" or "please".

Wrong: He let's his assistant choose the music.
Right: He lets his assistant choose the music.

Similar mistakes to watch for

Once you train your eye on lets vs let's, you'll spot other tiny but meaningful errors like its/it's or your/you're. Use the same expansion and subject checks for those.

its vs it's: expand "it's" to "it is" or "it has" to test correctness.
your vs you're: expand "you're" to "you are" and see if it fits.
we're vs were: expand "we're" to "we are"; if it's past tense, use "were".

Wrong: Its a good idea to update the spreadsheet.
Right: It's a good idea to update the spreadsheet.
Wrong: Your going to love the revision notes.
Right: You're going to love the revision notes.

FAQ

Is 'Lets' ever correct with an apostrophe?

No. With an apostrophe it becomes "let's", the contraction of "let us". "Lets" without an apostrophe is correct only as the third-person singular verb.

Can I use "let's" in formal writing?

Avoid "let's" in formal documents. Use "let us", "we should", or a directive like "please" to sound professional.

What's the fastest way to check lets vs let's?

Expand "let's" to "let us". If the sentence still makes sense and includes the speaker, use "let's". If not, check whether the subject is third-person and needs "lets" or whether a different verb fits better.

Why do native speakers still make this mistake?

Because the spoken forms are identical and the apostrophe is easy to miss when typing quickly. Mobile keyboards and autocorrect also drop or move apostrophes.

Will grammar checkers always catch this?

Many modern checkers flag lets/let's errors, but they can miss ambiguous contexts. Use the expand-to-"let us" test plus a quick subject check for reliable results.

Spot it faster: add a quick check to your writing routine

Make the expand-to-"let us" test one of your final checks before sending emails or submitting work. It takes two seconds and prevents a common visible error.

If you want automated help, paste sentences into a grammar tool to highlight apostrophe mistakes and offer rewrite suggestions so you don't have to second-guess.