Some "e"-stem verbs have abbreviated (irregular) oblique forms, where /n/ or /l/ is elided. This class includes only four frequently used verbs. In Finnish, verbs have an infinitive form, marked with "-ta" and used in the infinitive, and an oblique form, which is used in personal forms. Consonant gradation and assimilation of the 't' in "-ta" may be applied. In the standard language, the correspondence between the two is always regular. In spoken language, some verbs have assimilated oblique forms, while retaining the regular infinitive: