This is one of the highest-value distinctions in all of Afrikaans, because a single English word — when — maps onto three different Afrikaans words, and English gives you no instinct for which to use. The good news is that the rule is unusually clean. Once you internalise the three-way split, you'll get it right almost every time. The core idea: toe is for a single completed event in the past, as is for the future and for repeated "whenever," and wanneer is for questions.
The whole rule in one table
| Word | Use it for | Tense | English "when" |
|---|---|---|---|
| toe | a single, finished event in the past | past only | "when I arrived..." |
| as | the future, and repeated / habitual "whenever" | present / future | "when you come...", "whenever it rains" |
| wanneer | questions (direct and embedded); formal "whenever" | any | "when does the train leave?" |
All three are subordinating conjunctions, which means the clause they introduce sends its verb to the very end — see subordinating conjunctions for the structural rule. The choice between them is purely about meaning, not about word order.
toe — one finished moment in the past
toe points at a single, specific, completed event in the past: the moment the phone rang, the day you were born, the year you moved house. It is past-tense only. You can never use toe about the future, and you should not use it for repeated past events (that's a job we'll come back to). Think of it as a finger pointing at one frozen moment on the timeline behind you.
Toe ek jonk was, het ek elke somer by die see gaan kuier.
When I was young, I spent every summer at the sea.
Toe die telefoon lui, het almal stilgeword.
When the phone rang, everyone went quiet.
Toe ek by die huis aankom, was die deur al oop.
When I got home, the door was already open.
Notice the pattern: when the toe-clause comes first, the main clause inverts — het ek..., was die deur... — with the verb jumping ahead of the subject. That inversion is automatic after any fronted subordinate clause.
A word of warning: toe has a second life as the time adverb "then" (Eers het ons geëet, toe het ons gery — "First we ate, then we drove"). That's a different word doing a different job; see the dedicated toe vs toe discussion. On this page we're only concerned with toe the conjunction.
as — the future and "whenever"
as does double duty. First, it is "when" for events that haven't happened yet — anything in the future. Second, it is "when(ever)" for repeated or habitual situations. If the action lies ahead of you, or happens again and again, you want as.
Future:
As jy klaar is, bel my.
When you're done, call me.
As ek genoeg geld het, gaan ek 'n nuwe kar koop.
When I have enough money, I'm going to buy a new car.
Repeated / habitual:
As dit reën, bly die honde binne.
When(ever) it rains, the dogs stay inside.
As ek moeg is, drink ek 'n koppie tee.
When(ever) I'm tired, I have a cup of tea.
The overlap with English "if" is real and useful: As dit reën... can mean both "when it rains" and "if it rains," because Afrikaans uses the same word for conditional "if" and future/habitual "when." That single word covers ground English splits between "if," "when," and "whenever."
wanneer — questions (and formal "whenever")
wanneer is the question word. Use it whenever you're asking when? — in a direct question, or embedded inside a larger sentence (an indirect question). See wh-questions for the question machinery.
Wanneer vertrek die trein?
When does the train leave?
Ek weet nie wanneer hy terugkom nie.
I don't know when he's coming back.
Wanneer het jy laas met haar gepraat?
When did you last speak to her?
Beyond questions, wanneer can also mark a slightly more formal or emphatic "whenever," especially in writing or in the fixed phrase elke keer wanneer ("every time that").
Elke keer wanneer ek hom sien, lyk hy meer bekommerd.
Every time I see him, he looks more worried.
This formal "whenever" overlaps with as, and in everyday speech as is more common. But wanneer is never wrong in this slot, and it's the safe choice in formal writing.
A quick decision flowchart
Ask yourself two questions in order:
- Is it a question? (Are you asking when?) → wanneer.
- If not, is the event in the past and finished? → toe. Otherwise (future, or "whenever") → as.
That's the whole system. The only real subtlety is remembering that past beats repeated: a habitual event in the past still takes toe, not as.
Common mistakes
❌ Wanneer ek klein was, het ons op 'n plaas gewoon.
Incorrect — a single past situation needs toe, not the question-word wanneer.
✅ Toe ek klein was, het ons op 'n plaas gewoon.
When I was little, we lived on a farm.
❌ Toe jy klaar is, bel my.
Incorrect — toe is past-only; for a future event use as.
✅ As jy klaar is, bel my.
When you're done, call me.
❌ As ek jonk was, het ek baie gespeel.
Incorrect — this is a past situation, so it takes toe even though it's habitual.
✅ Toe ek jonk was, het ek baie gespeel.
When I was young, I played a lot.
❌ Ek weet nie as hy kom nie. (meaning 'I don't know when he's coming')
Incorrect — an embedded question about time needs wanneer, not as.
✅ Ek weet nie wanneer hy kom nie.
I don't know when he's coming.
❌ As vertrek die trein?
Incorrect — a direct 'when?' question takes wanneer.
✅ Wanneer vertrek die trein?
When does the train leave?
Key takeaways
- One English "when" splits three ways: toe = single past event; as = future and "whenever"; wanneer = questions.
- toe is past-only and points at one finished moment. A habitual past event still takes toe, not as.
- as also covers conditional "if," so As dit reën means both "when it rains" and "if it rains."
- wanneer is the question word, direct or embedded; it doubles as a more formal "whenever" (often elke keer wanneer).
- All three are subordinating — the verb goes to the end of the clause. See temporal conjunctions for the wider family.
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