I. Those ending in -en; as _soften_, _whiten_, _strengthen_, &c. Here the -en is a derivational affix; and not a representative of the Anglo-Saxon infinitive form -an (as _lufian_, _bærnan_ = _to love_, _to burn_), and the Old English -en (as _tellen_, _loven_). II. Transitive verbs derived from intransitives by a change of the vowel of the root. _Primitive Intransitive Form._ _Derived Transitive Form._ Rise Raise. Lie Lay. Sit Set. Fall Fell. Drink Drench. In Anglo-Saxon these words were more numerous than they are at present. _Intrans. Infinitive._ _Trans. Infinitive._ Yrnan, _to run_ Ærnan, _to make to run_. Byrnan, _to burn_ Bærnan, _to make to burn_. Drincan, _to drink_ Drencan, _to drench_. Sincan, _to sink_ Sencan, _to make to sink_. Liegan, _to lie_ Lecgan, _to lay_. Sittan, _to sit_ Settan, _to set_. Drífan, _to drift_ Dræfan, _to drive_. Fëallan, _to fall_ Fyllan, _to fell_. Wëallan, _to boil_ Wyllan, _to make to boil_. Flëogan, _to fly_ A-fligan, _to put to flight_. Bëogan, _to bow_ Bígan, _to bend_. Faran, _to go_ Feran, _to convey_. Wacan, _to wake_ Weccan, _to waken_. All these intransitives form their præterite by a change of vowel; as _sink_, _sank_; all the transitives by the addition of d or t, as _sell_, _sell'd_. III. Verbs derived from nouns by a change of accent; as _to survéy_, from a _súrvey_.