turn it of (off)

Using "of" instead of "off" in commands like "turn it off" is a common typo that changes meaning. Below are clear rules, many ready-to-copy examples, and simple fixes you can use at work, school, or in casual writing.

Quick answer

"Off" is the particle in the phrasal verb "turn off" meaning "deactivate" or "stop." "Of" is a preposition and is incorrect in this sense. Write "turn off" or "turn the X off" - never "turn the X of" when you mean to switch something off.

Correct: Please turn the lights off.
Incorrect: Please turn the lights of.
With pronouns, place the pronoun before "off": "turn it off," not "turn off it."
Hyphenate only when the phrase is a noun or adjective: "a turn-off" (something that repels).

Core explanation

"Turn off" is a separable phrasal verb: the particle "off" completes the meaning of "turn." In speech "off" can sound like "of," which causes the error in writing. "Of" never performs the particle role here; it is a preposition with different grammar and meaning.

Key points:

As a verb phrase: write two words - "turn off," "turn the alarm off."
With pronouns: the pronoun typically comes between verb and particle - "turn it off."
As a noun or adjective: use a hyphen - "a turn-off moment."

Spacing and hyphenation

Keep the verb phrase open (two words) when it acts as a verb. Only hyphenate when you turn the phrase into a compound noun or modifier.

Verb: Please turn the heater off.
Noun/adjective: The loud music was a real turn-off; a turn-off behavior.

Real usage: work, school, casual

Here are clear, natural sentences showing the correct form in typical contexts.

Work
- Please turn off your workstation before leaving the office.
- Turn the projectors off after the presentation.
- Remember to turn off notifications during the client call.
School
- Please turn your laptop off before the exam begins.
- Turn the classroom lights off when you leave.
- Make sure to turn off group notifications during study time.
Casual
- Can you turn off the TV? I need some quiet.
- Don't forget to turn off the coffee maker.
- She turned her phone off during dinner.

Wrong vs right examples you can copy

Six quick pairs to train your eye. Fix the particle, then reread for tone.

Wrong: Please turn the computer of when you're done.
Right: Please turn the computer off when you're done.
Wrong: Turn the alarm of before the meeting.
Right: Turn the alarm off before the meeting.
Wrong: Could you turn the lights of in the hallway?
Right: Could you turn the lights off in the hallway?
Wrong: He always turns his phone of at dinner.
Right: He always turns his phone off at dinner.
Wrong: Please turn the heater of - it's getting warm.
Right: Please turn the heater off - it's getting warm.
Wrong: Turn the music of when the guest arrives.
Right: Turn the music off when the guest arrives.

How to fix your own sentence

Don't just swap words. Check the sentence for clarity and tone after fixing the particle.

Step 1: Identify what you want to happen (deactivate, stop, remove power).
Step 2: Use the verb phrase "turn off" or "turn the X off."
Step 3: Reread the whole sentence and adjust wording if it still sounds awkward.

Examples of quick rewrites:

Original: Please turn the computer of if you finish early.
Rewrite: Please turn the computer off if you finish early.
Original: Is that machine Please turn the this afternoon?
Rewrite: Can you turn the machine off this afternoon?
Original: The lights Please turn the after the event.
Rewrite: Please turn the lights off after the event.

A simple memory trick

Connect form to meaning rather than sound. Picture "turn off" as an action that stops power or activity. Because "off" signals stopping, substitute it mentally before writing.

Hear "off" as the end of the action - that helps avoid "of."
Spot-check drafts for "of" after "turn" and replace with "off" when the meaning is deactivate.
Search your documents for common targets (lights, phone, alarm) and fix them in bulk.

Similar mistakes to watch for

Fixing one particle error often reveals related spacing and form mistakes nearby. Scan for these patterns:

Other split words: e.g., "alot" vs "a lot."
Hyphen confusion: e.g., "check-in" (noun) vs "check in" (verb).
Verb-particle order: e.g., wrong pronoun placement ("turn off it").
Word-class confusion: using a preposition where a particle is required.

FAQ

Is "turn of" ever correct?

Not when you mean "deactivate." "Of" can appear near "turn" in other phrases (e.g., "turn of the century"), but never as the particle that means "switch off."

Why do learners write "turn it of"?

"Of" and "off" can sound alike in casual speech. Learners often map pronunciation directly to spelling, or they substitute a familiar preposition by habit.

When should I hyphenate "turn-off"?

Hyphenate only when the phrase functions as a noun or adjective: "a turn-off" or "a turn-off moment." As a verb phrase, keep two words: "turn off the radio."

Which order is better: "turn off the lights" or "turn the lights off"?

Both are correct. In formal writing, "turn off the lights" is slightly preferred for flow. With pronouns, use "turn them off."

Will a grammar checker catch this?

Most grammar checkers flag "turn it of" and suggest "turn it off." Still, quickly reread to ensure the suggested change matches the intended meaning.

One last quick tip

If you're unsure, rewrite the sentence in full: "Please turn off the [device]." That removes ambiguity and prevents the "of" mistake. Keep a short list of correct examples and copy the closest one when needed.