Root flexion
Root inflection is the creation of derived grammatical forms of a word by changing the word's root, i.e. H. of the word stem .
The German used the principle of Wurzelflexion as Ablaut for example in the area of Tempus formation of strong verbs (Ex .: sing - sang - sung , sleep - sleep - sleep ). In the area of weak verbs , the tense is not formed by root inflection, but by affixes (e.g. laugh - laughed - laughed ). However, there are also verbs that combine both methods (e.g. burn - burned - burned ).
Root flexion also plays a certain role in German in the area of plural formation of nouns (e.g. garden - gardens ).