Dropping the third-person singular -s (The dog enjoy → The dog enjoys) is a small slip that makes a sentence read as ungrammatical. Below are concise rules, clear wrong/right pairs, quick checks, and rewrite templates you can use for work, school, and casual writing.
Use the He/She/It swap, a short checklist, and the examples below to spot and fix errors fast.
When the subject is third person singular (he, she, it, or a singular noun like "the dog"), add -s or -es to the base verb in present simple: write "The dog enjoys," not "The dog enjoy." If an auxiliary or modal is present, the main verb stays in base form (The dog does enjoy; The dog can enjoy).
Not in standard present simple with a singular subject. Most readers will see it as a typo or a nonstandard form. The safe choice in professional, academic, and everyday writing is "The dog enjoys."
Use "The dog enjoys." Errors often survive because the spoken phrase sounds plausible without the -s. Focus on the written form: read the full sentence aloud with he/she/it to hear whether -s is needed.
Spacing and hyphenation mistakes can look similar-check whether the word should be one unit, hyphenated, or split.
These slips often come from drafting quickly, relying on sound, or not rereading carefully. Typing fast and skimming during edits both increase the chance of dropping the -s.
Seeing the correct form used naturally helps you internalize it faster than memorizing rules. Below are examples that show how the correct form appears across contexts.
Test the full sentence, not just the phrase. Swap the subject for he/she/it and read aloud; context usually makes the right form obvious.
These pairs show the correction instantly. Copy the right versions when you need quick fixes.
Correcting the form is usually straightforward, but always reread the whole sentence to make sure the tone and meaning still fit.
Picture the correct form as a single unit tied to the meaning. When the subject is a single person or thing, mentally tag the verb with an "s" sound: he/she/it + verb-s.
Fixing one error often reveals related slips nearby. Do a quick scan for these patterns:
Not in standard present simple with a singular subject. Use "does enjoy" if you need an emphatic form (The dog does enjoy) or use "enjoy" with plural subjects (The dogs enjoy).
Add -es for verbs ending in s, sh, ch, x, or z (watch → watches). For verbs ending in a consonant + y, change y → i and add -es (carry → carries). For vowel + y, just add -s (enjoy → enjoys).
Swap the subject for he/she/it and read the sentence aloud. If it sounds like it needs an -s, add it. For negatives or questions, try the auxiliary "does" and keep the main verb in base form.
Indefinite pronouns such as everyone, someone, each, and anybody are singular in grammar and take -s: Everyone enjoys, Someone is, Each student submits.
Yes-most grammar checkers flag subject-verb agreement and suggest fixes. Use them as a second pass after your own quick checks.
Replace the subject with he/she/it and listen for the -s. If the sentence still sounds correct with -s, make the change or rephrase to a plural subject or a modal construction.
For a final pass, paste a sentence into a grammar checker to highlight any remaining subject-verb disagreements and get a suggested fix.