There are a few verbs that end in -iën. The dieresis over e indicates that e is the beginning of a new syllable. Normally, ie is pronounced as ee in the English verb seek, but iën is pronounced as English ee-ye.
The stem of an -iŽn verb ends in ie
When we derive the stem of an -iŽn verb, we only subtract -n. We maintain -e but we remove the dieresis. For example:
Now that you know how to derive the stem from an infinitive, you will be able to conjugate a verb in all eight tenses. You will find that to do this properly, you cannot do without the knowledge about the stem you obtained in this section.