Answer:With regular verbs, you create a past-tense form from the stem (also sometimes called the base) by adding a suffix: for example, talk/talked. The past participle is created in this same way. The same can be said of certain irregular verbs. Case in point: burn/burnt, where the latter is the participle form.
Notice in the foregoing examples, the stem stays the same. With a stem-changing verb the base and past tense form differ from each other right in the stem, most often in the vowel. Take, for instance, drive/drove. Another example is read [ri:d] vs. read [red].
Explanation:he most common stem change is e>ie. That means the stressed letter e in the stem of the verb will change to ie in certain forms of the verb. If a verb has two e's in the stem, it will always be the second e that undergoes a stem change.The verb cerrar is typical of an ‐ar verb with an e>ie stem change.
