This section explains how to form questions that can be answered with yes or no. The main rule is moving the conjugated verb to the first position in the sentence. These types of questions can be categorized as follows:

If there is only one simple verb in a sentence, you should only change the place of the verb with the subject.

In some cases, instead of one simple verb you have more complicated verb constructions. When you have a main verb with a modal or auxiliary verb, the inversion happens to the conjugated part.

In a yes/no question with a separable-prefix verb, the conjugated verb comes first and the prefix must go to the end of the sentence.

These questions must start with a certain question word (W-Wörter). Question-words are followed by the verb. Here are some of the common question words in German:

This word is used to ask about the identity of a person.

This question word is used to ask about a thing or concept.

This question word is used to ask about the location of something.

This question word is used to ask about the origin place of something.

This question word is used to ask about the destination place.

This question word asks about a point in time.

This question word asks for a reason of something like an event or an action.

This question word is used to ask about the quality or manner of something.

This question word focuses on a choice between different options. It is a bit different from other question words since it must be declined and get special endings in order to match the case, gender, and number of the noun. Here is the declension table for "welcher":

These question words are used to ask about the quantity of something. The difference is that "wie viel" is used for uncountable noun and "wie viele" is used for countable nouns.