corrugativus

例句：

1. 1.The irregular verb "to be" is used to indicate the state of being.
   不规则动词“是”用来表示存在的状态。
2. 2.In English, irregular verbs can have different forms depending on their tense and person.
   在英语中，不规则动词根据时态和人称有不同的形式。
3. 3. Irregular verbs are often difficult for learners to grasp because they don't follow a regular pattern.
   不规则动词对学习者来说往往难以掌握，因为它们并不遵循常规的模式。