go on vs go off vs come on (Murphy Unit 141)
Pattern
Section titled “Pattern”Three “go/come + particle” phrasal verbs that look similar but mean different things.
| Phrasal verb | Meaning | Use |
|---|---|---|
| go on | continue / happen | The meeting went on for hours. |
| go off | start sounding (alarm, siren, gun, bomb) | The alarm went off at 6am. |
| come on | start working (light, power) | The lights came on at dusk. |
“Go on” — continue
Section titled ““Go on” — continue”“Go on” = an event, talk, or action that continues forward in time.
- The meeting went on for hours. (continued)
- Please go on, I’m listening. (continue talking)
- What’s going on here? (happening)
- She went on and on about her trip. (kept talking)
Root metaphor: time/event “goes forward” → continues.
“Go off” — start sounding
Section titled ““Go off” — start sounding”“Go off” = a device whose sound starts without manual activation.
- The alarm went off at 6am. (started ringing)
- A siren went off in the distance. (started sounding)
- The smoke detector went off. (started beeping)
- The gun went off. (fired)
- The bomb went off. (exploded)
Root metaphor: the sound “goes off” into the air — leaving the device involuntarily.
Special case: “go off” only works for sounds and explosions. Not for lights, not for engines. The verb’s target is something that “fires” or “sounds”.
“Come on” — start working
Section titled ““Come on” — start working”“Come on” = a device, system, or condition that starts being active or available.
- The lights came on at dusk. (started working)
- The power came on after the storm. (became available)
- The heat came on automatically. (started)
- I can feel a cold coming on. (starting to develop)
Root metaphor: the device/system “comes into being” — arrives into an active state.
The “go” family for devices
Section titled “The “go” family for devices”| Phrasal verb | Use | Example |
|---|---|---|
| go on | continue (action/talk/event) | The show went on despite the rain. |
| go off | start sounding (alarm, gun, bomb) | The alarm went off at 6am. |
| come on | start working (light, power) | The lights came on at dusk. |
| turn on | activate manually | Turn on the radio. |
| turn off | deactivate manually | Turn off the TV. |
| switch on/off | same as turn on/off | Switch off the engine. |
| put on | activate (clothes, music, show) | Put on a song. |
| take off | remove (clothes) / depart (plane) | The plane took off. |
| get off | disembark | Get off the bus. |
Test application
Section titled “Test application”I was standing by the car when suddenly the alarm ___.
Answer: went off. Alarm = sounds without manual activation. “Went off” = started sounding.
Why not the others?
- turned on — alarms aren’t manually activated; you don’t “turn on” an alarm to make it ring
- put on — used for clothes/music/show, not alarm sounds
- got off — means disembark; no alarm context
Indonesian trap
Section titled “Indonesian trap”Indonesian uses bunyi (sound) and lanjut (continue) and menyala (light up) as unrelated words. English uses one verb (“go”) with two particles to express different concepts. The verb is the same; the particle changes everything.
- Alarmnya bunyi (the alarm sounded) → “The alarm went off” — not “went on” (which is continue)
- Lanjut bicara (continue talking) → “Go on” — not “go off”
- Lampu menyala (light came on) → “The lights came on” — not “went on”
The English pattern forces you to distinguish what kind of “start” the verb expresses.
Cure-Dolly summary
Section titled “Cure-Dolly summary”| Verb + particle | Root metaphor | Meaning |
|---|---|---|
| go on | go forward in time | continue |
| go off | go off into the air (sound leaving) | start sounding |
| come on | come into being / activation | start working |
Same verb, three different particles, three different root images.
Source
Section titled “Source”Raymond Murphy, English Grammar in Use (4th ed.), Unit 141 — Phrasal verbs on/off 2. Ebot lesson 2026-08-29: “the alarm ___” → went off (alarm started sounding, involuntary). User’s gloss: “go on is continue, go off is starting to sounding.”