Dutch strong verbs and their vowel-change patterns

Most Dutch verbs build the past by adding -te or -de to the stem (see the simple past of regular verbs), but strong verbs change the vowel in the middle instead: lopen → liep → gelopen (to walk). You cannot fully predict the change, but these verbs fall into a handful of vowel-change groups.

A strong verb keeps a regular present tense and changes only its past and its participle, so for each verb you learn three forms: the infinitive, the simple past, and the past participle.

1. The present tense is normal: ik loop, jij loopt, wij lopen (I walk, you walk, we walk).
2. The simple past changes the vowel and adds no ending: liep (walked). The plural adds -en: ik liep but wij liepen.
3. The past participle also has the changed vowel and, unlike regular verbs, ends in -en (not -d / -t): gelopen. It still takes ge- at the front — more in how to form the past participle.

Most strong verbs follow one of a few patterns; learning one verb per group helps you guess the rest. Each row shows the infinitive vowel, the past, and the participle. In the patterns below, ee/e and oo/o are the same long sound, not a second vowel change — a long vowel is written double in a closed syllable (bleef, bood) but single in an open one (ge-ble-ven, ge-bo-den).

In the e → a groups the singular past has a short vowel but the plural stretches it to a long one: ik nam but wij namen, ik gaf but wij gaven, ik las but wij lazen. Say the plural with the longer aa-sound even though it is written with one a (in an open syllable a single vowel is already long).

• The simple past tells a past story or describes the past in writing: Zij schreef een lange brief. (She wrote a long letter.)
• The participle builds the present perfect, the everyday spoken past: Ik heb het boek gelezen. (I have read the book.)
• A few strong verbs describe movement or change and take zijn in the perfect: De film is begonnen. (The film has started.) — see hebben or zijn?.

The most common error is treating a strong verb like a regular one and gluing on -te / -de or a -d / -t participle. There is no lopte or geloopt — the vowel does the work, giving liep and gelopen. Because you cannot always tell a strong verb from a regular one by looking, the safe approach is to memorise the three forms of each new verb together (drinken – dronk – gedronken), the way you would learn sing – sang – sung in English.