The vowel change is unpredictable and simply must be learned.

This vowel changes to indicate the subjunctive and negation.

Typical of strong verbs is the vowel change.

The second, called strong verbs, forms the past tense with a zero ending and, in most cases, certain vowel changes.

Agar explains the vowel change stating that language is a more commonly used word.

The term is sometimes used to denote the same vowel change in other languages.

There are also a variety of vowel changes.

A summary of the main vowel changes is presented below.

You're obviously not going to get it, are you, it's another vowel change.

The I-umlaut is slightly more complex, and consists of the following vowel changes: