Gestern fuhr ich nach Hause.
English: Yesterday I drove home.
In German, 'Sonderformen der Vergangenheit' means special forms of the past tense. These are verbs that have irregular or unique forms in the past, such as strong verbs or verbs with vowel changes.
Use these special past forms in German when talking about completed actions in the past, especially in written texts or stories. Many common verbs have irregular forms in the Präteritum (simple past).
Gestern fuhr ich nach Hause.
English: Yesterday I drove home.
Er las ein interessantes Buch.
English: He read an interesting book.
Wir fanden den Schlüssel nicht.
English: We did not find the key.
Sie schrieb einen Brief.
English: She wrote a letter.