Purpose Clauses: um … zu / damit
When you want to explain why you are doing something, German uses special purpose clauses. These answer the question "What for?" or "In order to do what?" — and mastering them will make your German sound much more natural.
There are two main structures: um … zu + infinitive (same subject) and damit + full clause (different subject). Knowing which one to choose is the key skill this lesson covers.
um … zu (same subject)
Use um … zu + infinitive when the subject of the main clause and the purpose clause is the same person or thing.
Structure: main clause + um … zu + infinitive (at the end)
Ich lerne Deutsch, um in Berlin zu arbeiten. (I am learning German in order to work in Berlin.)
Key rules:
- The infinitive goes to the very end of the sentence.
- zu is placed directly before the infinitive.
- With separable verbs, zu slots between the prefix and the stem: aufzumachen, einzuladen.
- A comma before um is optional but common in writing.
damit (different subjects)
Use damit when the subject of the purpose clause is different from the subject of the main clause.
Structure: main clause, damit + new subject + … + conjugated verb (at the end)
Die Lehrerin spricht langsam, damit die Schüler sie verstehen. (The teacher speaks slowly so that the students understand her.)
Key rules:
- Damit introduces a subordinate clause → the conjugated verb goes to the end.
- A comma is always written before damit.
- You can also use damit with the same subject, but um … zu is the more natural choice.
Choosing the right structure
The deciding factor is always: same subject or different subject?
| Condition | Use | Pattern |
|---|---|---|
| Same subject | um … zu | main clause + um … zu + infinitive |
| Different subject | damit | main clause, damit + subject + … + verb |
Quick test: Try to translate with "in order to." If one subject works → um … zu. If a new person appears → damit.
Separable verb reminder:
| Base form | In um … zu |
|---|---|
| aufmachen | um aufzumachen |
| einladen | um einzuladen |
| anrufen | um anzurufen |
📖 Examples
Sie geht ins Fitnessstudio, um fit zu bleiben.
She goes to the gym in order to stay fit.
Er lernt jeden Tag, um die Prüfung zu bestehen.
He studies every day in order to pass the exam.
Wir fahren früh ab, um den Zug nicht zu verpassen.
We leave early so as not to miss the train.
Ich kaufe Blumen, damit meine Mutter sich freut.
I am buying flowers so that my mother is happy.
Der Arzt erklärt es langsam, damit der Patient alles versteht.
The doctor explains it slowly so that the patient understands everything.
Sie schreibt eine Liste, um nichts zu vergessen.
She is writing a list in order not to forget anything.
Ich rufe an, um einen Termin zu vereinbaren.
I am calling in order to make an appointment.
Die Eltern sparen, damit ihre Kinder studieren können.
The parents are saving money so that their children can study.
⚠️ Common Mistakes
Ich lerne Deutsch, um ich in Deutschland arbeite.Ich lerne Deutsch, um in Deutschland zu arbeiten.
With um … zu there is no new subject and no conjugated verb — only zu + infinitive at the end of the clause.
Ich rufe an, damit einen Termin zu vereinbaren.Ich rufe an, um einen Termin zu vereinbaren.
When the subject stays the same, um … zu is correct. damit must be followed by a full clause with its own subject and a conjugated verb.
Sie spricht langsam, damit die Schüler sie verstehen zu können.Sie spricht langsam, damit die Schüler sie verstehen können.
In a damit clause the verb is already conjugated (and goes last). Never add zu — that only belongs in um … zu constructions.
Er spart, um ein Auto kaufen.Er spart, um ein Auto zu kaufen.
zu is mandatory in um … zu constructions. It cannot be dropped, even when the meaning feels obvious.
✏️ Exercises
Test your understanding. Click an option or type your answer, then check.
Which sentence correctly uses um … zu?
Two different people are involved. Which sentence is correct?
Which is the correct form with the separable verb aufwecken? 'She is calling to wake him up.'
Which sentence means 'We are saving money so that our son can study'?
Which word correctly fills the blank? 'Ich mache Sport, ___ abnehmen.'
What is wrong with this sentence? 'Die Mutter kocht, damit die Kinder essen zu können.'
Ich gehe in die Bibliothek, um ein Buch ___ (ausleihen).
Der Lehrer wiederholt die Regel, ___ alle Schüler sie verstehen.
Er ruft sie an, um sie zum Essen ___ (einladen).
Die Eltern sparen, damit ihr Kind studieren ___ (können).