Modal verbs for guessing and hearsay: zal wel, moet wel, kan niet and zou
How Dutch modal verbs mark possibility, inference, probability, and unconfirmed reports in the present and past.
Het licht brandt nog; Noor moet nog op kantoor zijn. (The light is still on; Noor must still be at the office.) Here moet gives a conclusion based on evidence, not an obligation for Noor.
How do you choose a modal for a guess or report?
Use kan (wel) for a possibility, kan niet for something you rule out, moet (wel) for a compelling conclusion, zal (wel) for a probable assumption, and zou for unconfirmed information from another source.
- Decide whether you are giving your own assessment or passing on someone else's information.
- Choose the modal that matches the source and strength of that assessment.
- Use a simple infinitive for a state or event at the relevant time: De arts kan nog in gesprek zijn. (The doctor may still be in a meeting.)
- For an assessment made now about an earlier event, keep kan, moet, or zal finite and change the other verb to a perfect infinitive: Ze moet de datum verkeerd gelezen hebben. (She must have misread the date.)
| Assessment | Pattern | Example |
|---|---|---|
| One possibility | kan (wel) + infinitive | De bezorger kan wel bij de buren zijn. (The delivery driver may be at the neighbours' house.) |
| Ruled out as impossible | kan niet + infinitive | Deze pas kan niet van Leila zijn; haar naam staat op de andere. (This pass cannot be Leila's; her name is on the other one.) |
| Compelling conclusion from evidence | moet (wel) + infinitive | Alle stoelen zijn weg; de zaal moet al ontruimd zijn. (All the chairs are gone; the hall must have been cleared already.) |
| Probable assumption | zal (wel) + infinitive | Ravi zal wel in de trein zitten; hij vertrok een uur geleden. (Ravi is probably on the train; he left an hour ago.) |
| Unconfirmed report | zou + infinitive | Volgens de krant zou de brug maandag weer opengaan. (According to the newspaper, the bridge is reportedly due to reopen on Monday.) |
The particle wel often accompanies these assessments. It is common with kan and zal and can reinforce an inference with moet, but the modal supplies the main meaning. The bands also overlap: they describe how the speaker presents a conclusion, not fixed percentages.
How do you make an inference about the past?
For your own present assessment, keep kan, moet, or zal finite and put the other verb in the perfect infinitive, using a past participle with infinitival hebben or zijn. Reportive zou combines with the same kind of perfect infinitive.
Choose hebben or zijn as you would in the ordinary perfect tense. The finite modal gives your judgement now; the perfect infinitive places the assessed event earlier.
| Reading | Present or current form | Assessment about an earlier event |
|---|---|---|
| Possible | Mina kan ziek zijn. (Mina may be ill.) | Mina kan ziek geweest zijn. (Mina may have been ill.) |
| Impossible | De datum kan niet juist zijn. (The date cannot be right.) | De brief kan niet gisteren verstuurd zijn; hij draagt de datum van vandaag. (The letter cannot have been sent yesterday; it has today's date.) |
| Evidence-based inference | Mina moet thuis zijn; haar fiets staat buiten. (Mina must be at home; her bicycle is outside.) | Mina is er nog niet; ze moet zich verslapen hebben. (Mina is not here yet; she must have overslept.) |
| Probable assumption | Mina zal wel thuis zijn. (Mina is probably at home.) | Mina zal zich wel verslapen hebben. (Mina probably overslept.) |
| Reported information | Mina zou thuis zijn. (Mina is reportedly at home.) | Mina zou de trein gemist hebben. (Mina reportedly missed the train.) |
Compare Mina heeft langer moeten werken. (Mina had to work longer.) with Mina moet langer gewerkt hebben. (Mina must have worked longer.) The first puts an obligation in the past. The second makes a present inference about past work. The general modal-verb guide owns the ordinary ability, permission, and obligation meanings.
When do you use each reading?
- Use kan (wel) when the statement remains one live possibility: De storing kan tijdelijk zijn. (The fault may be temporary.)
- Use kan niet when your evidence rules the statement out: De aanvraag kan niet al zijn goedgekeurd; het gesprek is pas morgen. (The application cannot already have been approved; the interview is only tomorrow.)
- Use moet (wel) when the available facts push you towards one conclusion: Er liggen verse voetafdrukken in de hal; iemand moet binnen zijn geweest. (There are fresh footprints in the hall; someone must have been inside.)
- Use zal (wel) for a straightforward probability or assumption: De receptie zal wel gesloten zijn. (The reception desk is probably closed.) Context separates this reading from the future with zullen.
- Use reportive zou when you attribute information without confirming it yourself: De aannemer zou de regels hebben overtreden. (The contractor reportedly breached the rules.) A volgens phrase can name the source.
How do ordinary modal meanings differ?
Ordinary modal use describes the subject's ability, duty, or future action; the readings on this page evaluate whether a whole statement is true.
| Form | Ordinary reading | Assessment or report |
|---|---|---|
| kunnen | Omar kan de kast openen. (Omar can open the cupboard.) — ability | Omar kan bij de receptie zijn. (Omar may be at reception.) — possibility |
| moeten | Yara moet vandaag thuiswerken. (Yara has to work from home today.) — obligation | Yara moet thuis zijn; haar jas hangt in de gang. (Yara must be at home; her coat is in the hall.) — inference |
| zullen | Yara zal morgen bellen. (Yara will call tomorrow.) — future statement | Yara zal wel onderweg zijn. (Yara is probably on her way.) — assumption |
| zou | Ik zou bellen als ik het nummer had. (I would call if I had the number.) — condition | De directeur zou vorige week zijn vertrokken. (The director reportedly left last week.) — report |
Reportive zou has the same form as conditional zou. A named or implied information source favours the reportive reading; an als condition favours the conditional reading.
Mistakes to avoid
- Do not put moeten in the past merely because the inferred event happened earlier. For a conclusion you draw now, use moet + past participle + hebben/zijn: Hij moet de afslag gemist hebben. (He must have missed the exit.)
- Do not read every moet as an instruction. Het alarm staat aan; de deur moet al gesloten zijn. (The alarm is on; the door must already be closed.) Here the speaker draws a conclusion.
- Do not present reportive zou as proof. It marks information obtained from another source while the speaker withholds full commitment.
- Keep the perfect infinitive together at the end of a main clause: Ze kan het bericht verkeerd gelezen hebben. (She may have misread the message.)
See also
Review ordinary meanings and forms in modal verbs. Compare probability with the simple future, and separate reportive zou from the conditional and the future and conditional perfect.
- The access badge works and the holder's name is already on the screen. Complete the inference: *De pas ___ al geactiveerd zijn.*
- moet
- kan niet
- zou
- moest
The visible evidence supports a compelling conclusion now, so *moet al geactiveerd zijn* means that the pass must already have been activated.
- Which sentence rules out a past event? The parcel label was printed this morning.
- Het pakket zal wel gisteren bezorgd zijn.
- Het pakket zou gisteren bezorgd zijn.
- Het pakket kan niet gisteren bezorgd zijn.
- Het pakket moest gisteren bezorgd zijn.
*kan niet* presents the proposition as impossible. *bezorgd zijn* is the perfect infinitive that places the supposed delivery in the past.
- Which sentence makes a present evidence-based inference about Noor's earlier action?
- Noor heeft de verkeerde ingang moeten nemen.
- Noor moest de verkeerde ingang genomen hebben.
- Noor zou de verkeerde ingang nemen.
- Noor moet de verkeerde ingang genomen hebben.
A present inference keeps *moet* finite and puts the earlier action in the perfect infinitive *genomen hebben*.
- Which sentence clearly passes on an unconfirmed report?
- Volgens de woordvoerder zou de directeur vorige week zijn vertrokken.
- De directeur moet vandaag vroeg vertrekken.
- De directeur kan goed alleen reizen.
- De directeur zal morgen vertrekken.
*Volgens de woordvoerder* names the source, and reportive *zou* shows that the speaker is relaying rather than confirming the information.
- You have no decisive evidence and make an ordinary probable assumption. Complete: *De monteur ___ onderweg zijn.*
- kan niet
- moet verplicht
- zou volgens
- zal wel
*zal wel* presents a plain probability: *De monteur zal wel onderweg zijn.*
Test yourself
Question 1 of 5
The access badge works and the holder's name is already on the screen. Complete the inference: De pas ___ al geactiveerd zijn.