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Suppose I want to write a sentence with the verb zumachen. It is composite, so in past participles and in constructs as zu + infinitive the added particles go between the prefix and the main verb.

How should I then say:

I want to close the window ?

Is it:

Ich will, das Fenster zuzumachen?

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As far as I know, the zu in zu + infinitive constructs is never graphically linked to the verb to which it adheres. Or maybe I'm dead wrong about it. – indoxica Jul 26 '13 at 13:59
@indoxica: Indeed, you are wrong. Verbs with separable prefixes have the zu after the prefix, but the form is written without spaces. Thus zuzumachen is correct. – chirlu Jul 26 '13 at 14:11
@chirlu Good to know. As I'm but a poor apprentice in the German language, it's always good to know everything pertaining to it. – indoxica Jul 26 '13 at 14:22
I suppose it's because it's poor: I should have looked up on the Internet for the existence of "zuzumachen". Moreover, my English sentence and my German translation do not match: the second one is wrong because no additional zu was required. – martina Jul 27 '13 at 20:28
up vote 3 down vote accepted

You just use it in the original form:

Ich will das Fenster zumachen (I want to close the window)

An example for 'zuzumachen':

Ich vergaß das Fenster zuzumachen (I forgot to close the window)

But honestly, I can't tell you the grammatical rule when to use which. Maybe someone else can help. Wiktionary calls the second form "erweiterter Infinitiv Aktiv" (extended infinitive active):

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Just a hint, if you're unsure about a sentence, just type it into google, and if you get very few or no results, it's most likely incorrect. – Martin Hansen Jul 26 '13 at 12:45
The rule is essentially that only modal verbs can take an infinitive without zu. – chirlu Jul 26 '13 at 12:52

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