What Does “Come on sth” Mean?
“Come on sth” means to happen or begin suddenly or unexpectedly on something, often related to a physical or emotional effect. It can also mean to start working or to have an effect on a particular thing.
Introduction
The phrase “come on sth” is a common phrasal verb in English that can be a bit confusing for learners. It usually describes when something begins or takes effect, especially suddenly or strongly. For example, a headache might “come on” during the day, or a machine might “come on” when you press a button. The phrase “come on sth” often implies the action is related to a specific object or condition. Understanding the “come on sth” meaning helps learners recognize when and how to use this expression naturally in everyday conversations.
Quick Info Box
- Phrasal verb: come on something
- Type: Intransitive (usually), sometimes transitive depending on context
- Level: B1 (Intermediate)
- Short meaning: To begin or start affecting something suddenly
Structure (Grammar Rules)
“Come on” is generally an inseparable phrasal verb, meaning the verb and particle stay together. However, when followed by a noun or pronoun (something), the object comes after the entire phrasal verb.
- Correct pattern: come on + something
- Example: The pain came on suddenly.
- Incorrect: The pain came it on.
Note: “Come on” can be followed by nouns, pronouns, or no object at all.
How to Use “Come on sth”?
Use “come on sth” when you want to describe something starting or beginning, especially effects or changes related to a particular thing. It often refers to physical sensations, machines, devices, or feelings.
- When a machine starts working: “The lights come on at sunset.”
- When symptoms start: “Dizziness came on after I stood up.”
- When feelings or emotions begin: “Confidence came on during the presentation.”
Examples
- The headache came on suddenly after lunch.
- When the heater comes on, the room warms up quickly.
- After a few minutes, the fog came on, making it hard to see.
- Confidence really came on when she practiced more.
- Electricity comes on automatically after a power outage.
Common Mistakes
- Incorrect: The pain came it on quickly.
- Correct: The pain came on quickly.
- Incorrect: The heater comes on it at night.
- Correct: The heater comes on at night.
Differences / Synonyms
“Come on sth” vs. “Turn on sth”: “Come on” means to start by itself or suddenly, often automatically. “Turn on” means to activate something intentionally.
“Come on sth” vs. “Set in”: “Set in” usually describes something (like bad weather or illness) starting to last for a long time, while “come on” can be sudden and temporary.
Common Collocations
- Come on the lights
- Come on the heater
- Come on a headache
- Come on a feeling
- Come on the TV
Related Phrasal Verbs
Here are related phrasal verbs of come on sth:
Real-life Dialogue
Anna: Did the air conditioner come on yet? It’s getting hot in here.
Ben: Yes, it just came on a few minutes ago.
Anna: Good! I was worried it wouldn’t start.
Ben: Sometimes it takes a little time to come on after you press the button.
Practice
Fill in the blank with the correct form of “come on”:
- The lights _______ automatically when it gets dark.
- A headache _______ after I skipped lunch.
- The heater didn’t _______ until I fixed the switch.
FAQs
- Q: Is “come on sth” separable?
A: No, it is usually inseparable; the object comes after the entire phrase. - Q: Can “come on” be used without an object?
A: Yes, it can be used without an object, e.g., “The pain came on.” - Q: What is the difference between “come on” and “turn on”?
A: “Come on” is often automatic or sudden; “turn on” is intentional activation. - Q: Is “come on sth” formal or informal?
A: It is neutral and used in both formal and informal contexts. - Q: Can feelings “come on”?
A: Yes, feelings like confidence or fear can come on suddenly.
