when

A subordinating conjunction primarily used to introduce a dependent clause indicating the time at which the action or state expressed in the main clause occurs. 'When' is one of the most versatile and frequently used temporal conjunctions in English, capable of referencing specific moments, habitual occurrences, simultaneous actions, or conditional-temporal overlaps. Beyond strict chronology, it can also introduce concessive or contrastive clauses expressing surprise, irony, or unexpected juxtaposition. The conjunction is universally recognized across all dialects and registers, appears in contexts ranging from casual conversation to formal academic prose, and is typically acquired at the earliest stages of language learning. Punctuation follows standard adverbial clause rules: a comma is typically required when the 'when'-clause precedes the main clause, but omitted when it follows.

• 🇩🇪Subordinierende Konjunktion, die einen temporalen Nebensatz einleitet; sie bezeichnet den Zeitpunkt, die Bedingung oder den Umstand, unter dem die Handlung des Hauptsatzes stattfindet.

1. Introducing a specific point in time or temporal reference A1 informal

   Used to introduce a subordinate clause that specifies the exact moment, period, or occasion at which the action of the main clause occurs. This is the primary and most fundamental function of 'when' as a conjunction. The temporal relationship can reference past, present, or future time frames, with tense coordination following standard sequence-of-tenses conventions. The 'when'-clause may denote a single completed event, an ongoing state, or a recurring temporal marker. This usage is universal across all English varieties and registers, forming the backbone of temporal subordination in narrative, descriptive, and explanatory discourse.

   • When the clock struck midnight, the celebration officially began.
   • I was reading a book when the power suddenly went out.
   • She always feels most creative when she works early in the morning.
   • We'll discuss the proposal in detail when the stakeholders arrive next week.
   • He realized his mistake when he reviewed the final report.

   🇩🇪Einführung eines bestimmten Zeitpunkts oder Zeitbezugs

2. Expressing habitual, recurring, or general temporal reference A2 informal

   Used to introduce a clause describing a repeated event, habitual action, or general truth, where the main clause expresses what typically or invariably happens at that recurring temporal trigger. In this function, 'when' is semantically equivalent to 'whenever' and emphasizes predictability, routine, or universal applicability rather than a single instance. The present simple tense is typically used in both clauses to indicate habitual or timeless reference. This usage is prevalent in descriptions of routines, procedures, natural phenomena, scientific laws, and cultural norms.

   • When temperatures drop below freezing, water expands and can crack pipes.
   • She always double-checks her calculations when she works with financial data.
   • When the system detects an error, it automatically logs the incident and alerts administrators.
   • He tends to become more reflective when he walks alone in nature.
   • When students engage actively in discussions, their comprehension and retention improve significantly.

   🇩🇪Ausdruck eines habituellen, wiederkehrenden oder allgemeingültigen Zeitbezugs

3. Indicating simultaneous or overlapping actions B1 informal

   Used to introduce a clause where the action or state described occurs concurrently with, or overlaps temporally with, the action in the main clause. In this usage, 'when' emphasizes temporal coincidence rather than strict sequence, often implying that two events unfold in parallel or that one action occurs during the duration of another. The conjunction may pair with continuous or progressive verb forms to highlight ongoing simultaneity. This function is common in narrative, descriptive, and explanatory contexts where temporal coordination enhances clarity or dramatic effect.

   • When she was presenting the findings, her colleagues were taking detailed notes.
   • He listened to podcasts when he commuted to work every morning.
   • When the software is processing large datasets, system performance may temporarily decrease.
   • They discussed the strategy when they were walking through the park.
   • When the audience was applauding, the performers took their final bow.

   🇩🇪Gleichzeitige oder sich überschneidende Handlungen

4. Introducing concessive or contrastive temporal clauses C1 formal

   Used to introduce a clause that expresses surprise, irony, or unexpected juxtaposition, where the temporal marker 'when' carries an implicit concessive or contrastive meaning equivalent to 'although', 'considering that', or 'despite the fact that'. In this rhetorical function, 'when' highlights a perceived inconsistency, paradox, or counterexpectation between the two clauses. This usage is prevalent in argumentative, literary, and persuasive discourse, where it serves to underscore contradiction, emphasize a point, or provoke reflection. The conjunction retains its temporal structure but acquires additional pragmatic force through contextual interpretation.

   • He claims to value transparency, when his decisions are consistently made behind closed doors.
   • The company promotes work-life balance, when employees routinely work sixty-hour weeks.
   • She criticized the policy for being impractical, when she had not reviewed the implementation guidelines.
   • The report emphasizes sustainability, when the proposed measures rely heavily on non-renewable resources.
   • They advocate for digital inclusion, when their platform remains inaccessible to users with disabilities.

   🇩🇪Einführung konzessiver oder kontrastiver Temporalsätze

Primarily an interrogative and relative adverb, or subordinating conjunction, used to refer to time. Note: 'When' is not classified as a determiner in modern English grammar. It does not modify nouns directly but functions to introduce questions about time, relative clauses referring to time, or temporal adverbial clauses. This entry includes its primary adverbial and conjunctive meanings for completeness.

• 🇩🇪Frage- oder Relativadverb sowie unterordnende Konjunktion, die sich auf einen Zeitpunkt oder Zeitraum bezieht. Hinweis: 'When' wird im modernen Englischen nicht als Determinativ klassifiziert, sondern fungiert als Adverb oder Konjunktion.

1. Interrogative adverb (time) A1 formal

   Used in questions to ask at what time or on what occasion something happens, happened, or will happen.

   • When does the train arrive?
   • When did you last see her?
   • When will the project be finished?

   🇩🇪Frageadverb (Zeit)

2. Relative adverb (time reference) A2 formal

   Used to introduce a relative clause that refers to a time or period mentioned previously. It functions to connect the clause to a time-related antecedent.

   • I remember the day when we first met.
   • There was a time when people wrote letters.
   • Summer is the season when flowers bloom.

   🇩🇪Relativadverb (Zeitbezug)

3. Subordinating conjunction (temporal clause) A2 formal

   Used to introduce an adverbial clause of time, indicating that one event happens at the same time as, before, or after another event.

   • Call me when you arrive.
   • When I was young, I loved to travel.
   • She was cooking when the phone rang.

   🇩🇪Subordinierende Konjunktion (Temporalsatz)

4. Conjunction (conditional or contrastive) B2 formal

   Used to introduce a clause expressing a condition, contrast, or concession, often equivalent to 'although' or 'considering that'.

   • Why walk when you can drive?
   • He claims to be busy, when in fact he is lazy.
   • How can you complain when you never try?

   🇩🇪Konjunktion (konditional oder kontrastiv)