C2 Advanced Syntax 5 min read 보통

Modale Passiversatzformen (sein + zu + Infinitiv)

Use 'sein + zu' to replace clunky passive modals for a sophisticated, professional, and concise German style.
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Grammar Rule in 30 Seconds

Use 'sein + zu + Infinitiv' to express necessity or possibility, functioning like a passive construction with 'müssen' or 'können'.

  • Expresses necessity: 'Die Aufgabe ist zu erledigen' (The task must be done).
  • Expresses possibility: 'Das ist kaum zu glauben' (That is hardly to be believed).
  • The construction is always passive in meaning, even if the verb is active.
Subject + sein + zu + Infinitiv

Overview

Ever felt like your German sentences are getting a bit too long? You are using müssen, können, and werden all in one breath. It sounds like a wordy textbook from 1950.
There is a sleeker way to speak. Meet the sein + zu + Infinitiv structure. This is the hidden passive of the German language.
It is elegant. It is professional. It makes you sound like a C2 native expert.
Think of it as the tuxedo of German grammar. You might not wear it to buy a kebab. However, you definitely want it for your next board meeting.
This structure replaces passive modal verbs. It tells us what must be done or what can be done. It is concise and powerful.
Let’s dive into how you can master it.

How This Grammar Works

This structure is a Passiversatzform. That is just a fancy way of saying it replaces the passive voice. Usually, you would say: Das Problem muss gelöst werden. That is four words just for the verb part!
With our new trick, you say: Das Problem ist zu lösen. It means exactly the same thing. The verb sein acts as the engine.
The zu and the Infinitive act as the cargo. It carries the meaning of either necessity or possibility. How do you know which one it is?
Context is your best friend here. Usually, in a positive sentence, it means must. In a negative sentence, it often means cannot. It is like a grammar chameleon. It changes its vibe based on the words around it.

Formation Pattern

1
Building this is easier than assembling IKEA furniture. You only need four steps.
2
Start with the Subject. This is the thing being acted upon.
3
Add the conjugated form of sein. Match it to your subject.
4
Place the word zu right before the end.
5
Put the Infinitive of your main verb at the very end.
6
Example: Die Dokumente (Subject) + sind (sein) + zu (zu) + unterschreiben (Infinitive).
7
Result: Die Dokumente sind zu unterschreiben. (The documents must be signed).
8
If you have a separable verb, zu crawls inside. Example: vorbereiten becomes vorzubereiten. It is like a little grammar sandwich.

When To Use It

You want to use this when you want to sound objective. It is very common in formal writing. Think of legal contracts or academic papers.
If you are writing a thesis, this is your best friend. It is also great for giving instructions without sounding bossy. Instead of saying
You must do this,
you say
This is to be done.
It creates a professional distance.
Use it in job interviews when discussing goals. Use it in emails to clients. Even in daily life, you will hear it in idioms.
Have you heard someone say Das ist nicht zu fassen? That is this exact rule! They are saying
That is not to be grasped
(It is unbelievable).
It adds a layer of sophistication to your speech that basic modals just cannot reach.

When Not To Use It

Do not use this for everything. If you are at a party, don't say Das Bier ist zu trinken. Your friends will think you have turned into a robot.
It is too stiff for casual hangouts. Also, avoid it if the doer of the action is the most important part. This structure focuses entirely on the object.
If you want to say
I must do this,
stick to Ich muss das tun. Das ist zu tun removes you from the sentence entirely. Use it only with transitive verbs.
These are verbs that take a direct object. You cannot really use it with verbs like schlafen or gehen. Es ist zu gehen sounds more like a philosophical riddle than a normal sentence.

Common Mistakes

Yes, even native speakers mess this up sometimes. The biggest mistake is confusing it with haben + zu. They look similar but are opposites. Sein + zu is passive. Haben + zu is active. If you say Der Chef ist zu sprechen, it means the boss is available to be spoken to. If you say Der Chef hat zu sprechen, it means the boss has to give a speech. Don't mix them up unless you want a very confused boss! Another mistake is forgetting the zu. Without it, the sentence just falls apart. Also, keep an eye on your endings. Since sein is the main verb, it must agree with the subject. If the subject is plural, use sind. If it is singular, use ist. Simple, right? Think of it like a grammar traffic light; green means go, but red (a missing zu) means a total crash.

Contrast With Similar Patterns

Let's look at the rivals. You have the standard passive: Das kann gemacht werden. This is safe but wordy.
Then you have the sich lassen + Infinitive: Das lässt sich machen. This also means
That can be done.
It feels a bit more modern and flexible. Our sein + zu pattern is the most formal of the three.
It carries more weight. While sich lassen usually implies possibility, sein + zu often implies a strong obligation. If a sign says Rauchen ist zu unterlassen, it is not a suggestion. It is a command.
It is much stronger than Hier darf nicht geraucht werden. Use sein + zu when the rule is non-negotiable.

Quick FAQ

Q

Does it always mean must?

Not always. In negative sentences, it often means cannot. Das ist nicht zu ändern means

That cannot be changed.

Q

Can I use it in the past tense?

Yes! Just change sein to war. Die Aufgabe war zu lösen (The task had to be solved).

Q

Is this common in spoken German?

Only in specific set phrases or very formal contexts. In a casual chat, it is quite rare.

Q

Can I use it with reflexive verbs?

Generally, no. It works best with simple transitive verbs like lesen, schreiben, or tun.

Formation with 'sein'

Subject sein zu Infinitive
Das
ist
zu
erledigen
Die {die|f} Aufgaben
sind
zu
erledigen
Es
war
zu
erledigen
Das
ist
nicht
zu
erledigen

Meanings

This construction acts as a modal passive, replacing 'müssen' (necessity) or 'können' (possibility) in passive sentences.

1

Necessity

Something must be done (equivalent to 'müssen' + passive).

“Das ist heute noch zu erledigen.”

“Die {die|f} Rechnung ist bis morgen zu bezahlen.”

2

Possibility

Something can be done (equivalent to 'können' + passive).

“Das ist kaum zu fassen.”

“Die {die|f} Lösung ist leicht zu finden.”

Reference Table

Reference table for Modale Passiversatzformen (sein + zu + Infinitiv)
Form Structure Example
Affirmative
sein + zu + Inf
Das ist zu tun.
Negative
sein + nicht + zu + Inf
Das ist nicht zu tun.
Question
sein + Subj + zu + Inf
Ist das zu tun?
Past
war + zu + Inf
Das war zu tun.
Possibility
sein + zu + Inf
Das ist zu schaffen.
Necessity
sein + zu + Inf
Das ist zu bezahlen.

격식 수준 스펙트럼

격식체
Die {die|f} Aufgabe ist zu erledigen.

Die {die|f} Aufgabe ist zu erledigen. (Workplace)

중립
Die {die|f} Aufgabe muss erledigt werden.

Die {die|f} Aufgabe muss erledigt werden. (Workplace)

비격식체
Man muss die Aufgabe machen.

Man muss die Aufgabe machen. (Workplace)

속어
Mach das mal.

Mach das mal. (Workplace)

Modal Passive Logic

sein + zu + Inf

Meaning

  • Müssen Must
  • Können Can

수준별 예문

1

Das ist zu machen.

This must be done.

2

Das ist nicht zu sehen.

That cannot be seen.

1

Die {die|f} Arbeit ist heute zu beenden.

The work must be finished today.

2

Das ist leicht zu verstehen.

That is easy to understand.

1

Die {die|f} Regeln sind genau zu befolgen.

The rules must be followed exactly.

2

Das ist kaum zu glauben.

That is hard to believe.

1

Der {der|m} Antrag ist bis Freitag einzureichen.

The application must be submitted by Friday.

2

Das Problem ist nicht zu lösen.

The problem cannot be solved.

1

Die {die|f} Konsequenzen sind sorgfältig zu prüfen.

The consequences must be carefully examined.

2

Das ist unter keinen Umständen zu tolerieren.

That is not to be tolerated under any circumstances.

1

Die {die|f} vorliegenden Daten sind kritisch zu hinterfragen.

The available data must be critically questioned.

2

Das ist als Erfolg zu werten.

That is to be considered a success.

혼동하기 쉬운

Modale Passiversatzformen (sein + zu + Infinitiv) 대 Passive Voice

Learners often use standard passive when this is more elegant.

자주 하는 실수

✗

Das ist machen.

✓

Das ist zu machen.

Missing 'zu'.
✗

Das ist zu gemacht.

✓

Das ist zu machen.

Using participle instead of infinitive.
✗

Das sein zu machen.

✓

Das ist zu machen.

Wrong conjugation.
✗

Ich bin zu gehen.

✓

Das ist zu gehen.

Subject mismatch.
✗

Das ist zu tun gewesen.

✓

Das war zu tun.

Wrong tense usage.
✗

Das ist zu nicht tun.

✓

Das ist nicht zu tun.

Negation placement.
✗

Das muss zu tun sein.

✓

Das ist zu tun.

Redundant modal.
✗

Das ist zu erledigt.

✓

Das ist zu erledigen.

Participle error.
✗

Das ist zu haben gemacht.

✓

Das war zu machen.

Complex tense error.
✗

Die {die|f} Aufgabe ist zu sein erledigt.

✓

Die {die|f} Aufgabe ist zu erledigen.

Syntax error.
✗

Das ist zu werden gemacht.

✓

Das ist zu machen.

Passive contamination.
✗

Es ist zu tun gewesen sein.

✓

Es war zu tun.

Tense confusion.

문장 패턴

Die {die|f} ___ ist zu ___.

Real World Usage

Administrative documents very common

Die {die|f} Frist ist zu beachten.

💡

Focus on Necessity

Use it primarily when you need to sound like a rule-maker.

Smart Tips

Replace 'muss gemacht werden' with 'ist zu machen'.

Das muss gemacht werden. → Das ist zu machen.

발음

zu er-LE-di-gen

Stress

Stress the infinitive verb.

Statement

Das ist zu TU-en.

Neutral declaration

암기하기

기억법

Think of 'sein + zu' as a 'Must-Do' or 'Can-Do' sticker on a task.

시각적 연상

Imagine a red stamp on a document that says 'TO BE DONE'.

Rhyme

Sein plus zu, macht den Satz im Nu, passiv und fein, so muss es sein!

Story

The boss hands me a file. He says, 'Das ist zu lesen.' I read it. Then he says, 'Das ist zu unterschreiben.' I sign it. It is all about what must be done.

Word Web

erledigentunmachenverstehenlösenprüfen

챌린지

Write 5 sentences about your daily chores using this structure.

문화 노트

This structure is beloved in German officialdom for its brevity and objective tone.

Derived from Middle High German, where 'zu' + infinitive indicated purpose or necessity.

대화 시작하기

“

Was ist heute noch zu erledigen?

일기 주제

List your tasks for tomorrow using the 'sein + zu' structure.

자주 하는 실수

Incorrect

정답

Incorrect

정답

Incorrect

정답

Incorrect

정답

Test Yourself

Complete the sentence.

Die {die|f} Arbeit ist ___ (erledigen).

✓ Correct! ✗ Not quite. Correct answer: zu erledigen
Correct structure.

Score: /1

연습 문제

1 exercises
Complete the sentence.

Die {die|f} Arbeit ist ___ (erledigen).

✓ Correct! ✗ Not quite. Correct answer: zu erledigen
Correct structure.

Score: /1

자주 묻는 질문 (1)

Yes, but it sounds very formal.

Scaffolded Practice

1

1

2

2

3

3

4

4

Mastery Progress

Needs Practice

Improving

Strong

Mastered

In Other Languages

French high

être + à + infinitif

German is more strictly used for modal passive.

Spanish moderate

ser + de + infinitivo

Spanish usage is less common than German.

Japanese partial

〜べきである

Japanese is a suffix, not a separate verb construction.

Arabic low

يجب أن

Arabic does not use an infinitive structure like German.

Learning Path

Prerequisites

Previous
Rezipientenpassiv (Dativ-Passiv) mit 'bekommen', 'erhalten' und 'kriegen'
Next
Semantische Unterscheidung: Genitivus objectivus und subjectivus

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