I. Theory
The preposition zu is often found before infinitives in German, much like “to” is in English. However, in German, zu is not present when there is a modal verb plus an infinitive. Therefore, zu is most frequently seen when the infinitive in question is in its own clause (an Infinitivsatz) or used in conjunction with a verb that is not a modal verb.For Example:
Ich möchte Deutsch lernen (no “zu” due to modal verb). I would like to learn German. |
But
Ich versuche, Deutsch zu lernen. I am trying to learn German. |