Here's why:
* Irregular verbs are verbs that do not follow the standard pattern of adding "-ed" to form the past tense and past participle. For example, "go" becomes "went" and "gone," not "goed" and "goed."
* "Break" follows the standard pattern:
* Present tense: break
* Past tense: broke
* Past participle: broken
* Present participle: breaking
* "Think" also follows the standard pattern:
* Present tense: think
* Past tense: thought
* Past participle: thought
* Present participle: thinking
Therefore, both "break" and "think" are regular verbs.