Infinitives with zu and um zu

01 / Understand

Use an infinitive clause for a second action

A sentence can describe one action through another verb. Ich versuche, früher zu kommen. says that the speaker is trying, and the content of that attempt is arriving earlier. The second verb is an infinitive rather than a finite form with its own subject ending. The particle zu comes immediately before an ordinary infinitive. This construction packages the second action as the content of an attempt, intention, decision, or similar relationship expressed by the main clause.

Learn the selecting expression together with its complement. Useful starters include versuchen, etwas zu tun, planen, etwas zu tun, and vergessen, etwas zu tun. These do not license every possible English verb followed by “to.” German verbs have their own complement patterns. Begin with a small set you can use confidently, then add a new verb only after checking a complete example. The infinitive names the action; the main verb tells the listener whether that action is planned, attempted, forgotten, or otherwise related to the speaker.

02 / Understand

Identify the understood actor

An infinitive clause normally has no overt subject of its own. Its actor is understood from the larger construction. In Ich plane, morgen anzurufen. the speaker plans and the speaker will make the call. Do not insert ich again inside the infinitive clause or conjugate anrufen as if it were an independent sentence. A helpful check is to ask who performs the action named by the infinitive, then confirm that the listener can recover that person from the main clause.

The understood actor is not always the main clause subject. In Ich bitte dich, kurz zu warten. the person asked is the person who waits. In Ich verspreche dir, morgen zu kommen. the speaker makes the promise and is also the person who comes. The different verbs establish different participant relationships. Memorizing “the subjects are always the same” would produce mistakes here. For unfamiliar verbs, learn a complete pattern showing both the recipient or object and the person understood to perform the infinitive action.

03 / Understand

Place zu correctly in separable and ordinary verbs

With an ordinary infinitive, write zu kommen or zu lernen as two words. With a separable verb, insert zu between the separable prefix and the verb, producing a single word: anzurufen from anrufen, aufzustehen from aufstehen, and mitzubringen from mitbringen. The complete infinitive clause still places this verbal expression at the end of its ordinary sequence. Do not leave the prefix behind in the main clause, where it belonged in a finite separable verb sentence.

Compare three useful versions: Ich rufe morgen an., Ich muss morgen anrufen., and Ich plane, morgen anzurufen. The first has a finite separable verb. The second has a modal and a bare infinitive. The third has a verb selecting a zu infinitive. These are different constructions of the same lexical action. The spelling tells the reader how that action is functioning. Learn inseparable verbs separately: besuchen gives zu besuchen, not an invented insertion inside its inseparable prefix.

04 / Understand

Contrast zu complements with bare modal infinitives

Core modal verbs such as müssen, können, dürfen and wollen take a bare infinitive in the patterns practiced here. Write Ich muss lernen., not an added zu form. A selecting verb such as versuchen has a different pattern: Ich versuche, zu lernen. Do not treat zu as a universal translation of English “to,” because English and German distribute infinitive markers differently. Identify the construction by the German word that selects the infinitive.

The distinction remains visible when the infinitive has an object or time detail. Wir wollen morgen die Wohnung besichtigen. expresses a wish or intention through a modal. Wir planen, morgen die Wohnung zu besichtigen. uses an expanded infinitive clause after planen. Both can describe related plans, but their grammar differs. Keep the noun phrase intact while checking the verb pattern. Adding more information between the main verb and the final infinitive does not change a bare modal infinitive into a zu infinitive.

05 / Understand

Use um zu to explain a purpose

A purpose clause tells why someone performs an action in terms of an intended goal. Ich gehe in die Bibliothek, um dort zu lernen. means the library visit is intended to make studying possible. The purpose has not necessarily been achieved. The ordinary personal pattern uses the same understood actor for the main action and the purpose action: the speaker goes and the speaker studies. Place um at the beginning of the purpose clause and the zu infinitive at its end.

If the intended actor differs, a finite clause with damit can make both participants explicit. Ich spreche langsam, damit du mich verstehst. has the speaker talking and the listener understanding. Replacing that clause mechanically with um would obscure or change the participant relationship. Use the same actor purpose pattern first, and choose damit when you need to name a different subject clearly. Also distinguish a goal from a reason: weil can explain a cause or circumstance, while um zu presents an intended outcome.

06 / Understand

Keep negation and reflexives tied to meaning

Negation can target either the main action or the infinitive action. Ich verspreche, nicht zu gehen. promises that the speaker will stay. Ich verspreche nicht, zu gehen. with an expanded, clearer context would deny making a promise to go rather than promise to stay. In practical writing, choose wording that makes the scope unmistakable. A safe complete contrast is Ich verspreche, heute nicht zu gehen. versus Ich gebe kein Versprechen, heute zu gehen. The position and structure affect what commitment is made.

Reflexive pronouns remain with the infinitive expression and refer to its understood actor. Ich versuche, mich zu entspannen. links mich to the speaker. Ich bitte dich, dich zu beeilen. links the second dich to the person asked. In a negative purpose, um den Zug nicht zu verpassen puts nicht before the infinitive phrase it negates. Read the intended result aloud in English before checking German form: are you avoiding a missed train, or denying that you have any intention at all? Those are different messages.

07 / Understand

Mark infinitive clauses with the appropriate commas

Current official German spelling rules separate infinitive subordinate clauses with commas. In the expanded clause Ich plane, morgen früher zu kommen., the comma marks the boundary before the infinitive content. A purpose clause also has its boundary marked: Ich spare, um ein Fahrrad zu kaufen. If an infinitive clause is inserted, mark both sides. These rules concern the grammatical structure, not a rule that a comma appears whenever there are more than a particular number of words.

There are limits to the shortcut. An unexpanded zu infinitive can sometimes be analyzed as a word group, permitting a version without a comma. A zu infinitive inside a multipart predicate is also treated differently, as in Du brauchst nicht zu warten. This lesson uses clearly expanded complement clauses and purpose clauses for production, so their commas are unambiguous. During revision, identify the selecting expression, the understood actor, and the complete infinitive clause before checking punctuation. Grammar and meaning should guide the boundary rather than an arbitrary pause in your reading.

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Common mistakes

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