WordFlex is an app to learn a foreign language, especially with many different forms. For each form, there is a seperate test. This page contains a description for all the tests, covering the following aspects:

• The name of the test, that is also shown in the settings of the WordFlex app.
• The word type from which the forms of the words are taken
• The prerequisites that have to be learned for a word before this test done. This is useful to first learn the basics and then the advanced forms.
• The rule that is applied to derive the regular form. For regular forms, only one representative out of all words needs to be learned, whereas all irregular forms need to be learned. The rule is simple, because it is quite difficult to learn a complex rule from a few examples. In particular, it does not include changes in the stem of the word.
  The rule is described as a table, where the first column contains a condition, the second column the rule that applies to words that match the condition of the first column, the third column the share of words where the condition matches (taken from the complete vocabulary) and the fourth column the percentage of matchting words with a regular form. For each word, the first matching condition is relevant in case of multiple matches.