German Infinitive with zu: How to Use It and When Not To

Learners searching 'German infinitive with zu' are usually confused because German zu-infinitives look similar to English infinitives but work differently. In English, you always say 'I want to go' — the infinitive follows automatically. In German, modal verbs never use zu (Ich will gehen, not ich will zu gehen), but many other verb constructions require it. Mastering zu-infinitives is essential for B1+ German and unlocks natural sentence structures that beginners can't produce.

When zu is NOT used: after modal verbs

After the six modal verbs, the bare infinitive is used — no zu. müssen: Ich muss arbeiten (I must work). können: Kannst du kommen? (Can you come?) wollen: Er will schlafen (He wants to sleep). sollen: Du sollst das machen (You should do that). dürfen: Darf ich fragen? (May I ask?) mögen/möchten: Ich möchte Kaffee (I would like coffee). Also no zu after: sehen (Ich sehe ihn kommen), hören (Ich höre sie singen), lassen (Ich lasse das reparieren), helfen in some constructions. These are bare infinitive verbs — zu would be incorrect.

When zu IS used: common verb constructions

Verbs that take zu + infinitive: anfangen: Ich fange an zu lernen (I start to learn). aufhören: Hör auf zu rauchen (Stop smoking). versuchen: Ich versuche zu schlafen (I try to sleep). vergessen: Er vergisst zu essen (He forgets to eat). vorhaben: Wir haben vor zu reisen (We plan to travel). beschließen: Sie beschlossen zu bleiben (They decided to stay). hoffen: Ich hoffe zu gewinnen (I hope to win). scheinen: Es scheint zu regnen (It seems to be raining). bitten: Er bittet mich zu helfen (He asks me to help). These are the most frequent zu-infinitive verbs in everyday German.

Um...zu: in order to

Um...zu means 'in order to' and is one of the most important infinitive constructions in German. Ich lerne Deutsch, um in Deutschland zu arbeiten — I learn German in order to work in Germany. Er geht ins Fitnessstudio, um fit zu bleiben — He goes to the gym to stay fit. The structure: um + rest of clause + zu + infinitive at the end. With separable verbs: Ich stehe früh auf, um den Zug nicht zu verpassen — I get up early so as not to miss the train. Note: zu goes between the prefix and the main verb in separable verbs: aufzustehen (the zu inserts). This construction appears constantly in German explanations, goals, and purpose statements.

Infinitive constructions in German conversation

Zu-infinitive constructions make German sentences sound natural and sophisticated. Compare: Ich will, dass ich schlafe (grammatically possible but unnatural) vs Ich will schlafen (I want to sleep — modal, no zu). Er versucht, dass er lernt (very unnatural) vs Er versucht zu lernen (He tries to learn — natural zu-infinitive). German speakers use these constructions constantly in everyday speech. Watching German TV shows with subtitles, you'll see zu-infinitives in practically every episode. Real German content is essential for developing the intuition for which verbs take bare infinitives and which take zu — a distinction that grammar study alone makes confusing but real exposure makes automatic.