only when

Học thuật
Thân thiện
only when

Call me only when your cold gets worse.

Definition
  1. Adverb:
    • Under the sole condition that; not except if: Used to introduce a necessary condition for something else to happen or be true. It emphasizes that the main clause's situation is contingent upon the specific circumstance described in the 'only when' clause.
Usage
  • The phrase "only when" is used to connect two clauses. It introduces a conditional clause that specifies the single, necessary time or circumstance for the event in the main clause to occur.
  • It is typically placed at the beginning of a sentence for emphasis, in which case the subject and verb of the main clause are often inverted. It can also be used in the middle of a sentence.
  • It expresses a stronger, more exclusive condition than the simple conjunction "when."
Examples
  • At the beginning of a sentence (with inversion):
    • Only when the last tree has died will people realize they cannot eat money.
    • Only when you have finished your homework can you watch television.
  • In the middle of a sentence:
    • The alarm will sound only when the door is opened.
    • She feels truly at peace only when she is hiking in the mountains.
Advanced Usage
  • "Only when... (do/does/did/will/can, etc.)...": This inverted structure is formal and emphatic. The auxiliary verb (do, does, did, will, can, etc.) is placed before the subject of the main clause.
    • Only when the data has been verified can we publish the results.
  • Implied exclusivity: The phrase strongly implies that the action in the main clause does not happen under any other condition.
    • The system activates only when pressure exceeds 50 psi. (It does not activate at 49 psi or any other time.)
Variants and Related Words
  • Only if: Very similar in meaning and often interchangeable with "only when," though "only if" can feel slightly more conditional than temporal.
    • I will go only if you go with me.
  • Provided that / Providing that: Conjunctions meaning "on the condition that." They are more formal synonyms for "only if."
  • Solely when: A more formal variant with identical meaning.
Synonyms
  • Exclusively when
  • Just when (in some contexts, though less formal)
  • Not unless
Related Phrases
  • If and only if: A logical and mathematical term for a biconditional statement, meaning that the two clauses are true under exactly the same conditions. It is a more precise and formal equivalent.
    • You will pass the course if and only if your final grade is above 70%.
Notes on Meaning
  • The core meaning is one of exclusive conditionality. It does not simply indicate time ("when"), but specifies that the time/condition introduced is the only one that will trigger the main event.
  • It is important to distinguish it from "when," which can indicate any instance of a recurring event, not an exclusive one.
    • Compare:
      • I drink coffee when I am tired. (I might drink it at other times too.)
      • I drink coffee only when I am tired. (I never drink it unless I am tired.)
only when

Call me only when your cold gets worse.

Adverb
  1. never except when
    • call me only if your cold gets worse

Từ đồng nghĩa