What makes a verb irregular?

does not form it's past and present by adding -ed or -d to the past participle

does not form it's past and past participle by adding -ed or -d to the present***

does not act as a verb in context

functions as a verb but appears as an adjective

You are correct!

To determine if a verb is irregular, you need to look at how it forms its past tense and past participle. Most regular verbs form these by simply adding -ed or -d to the base form of the verb. However, irregular verbs don't follow this pattern. They have unique and non-standard forms for the past tense and past participle. These irregular forms can vary widely and don't usually follow a predictable rule.

To identify if a verb is irregular, you can consult a list of irregular verbs, which you can find in grammar books, language resources, or online. These lists provide the irregular forms for each verb, including the past tense and past participle.

Keep in mind that irregular verbs can sometimes undergo spelling changes or have irregularities in verb conjugation patterns, such as vowel changes or completely distinct forms. It's essential to familiarize yourself with these irregularities to accurately identify and use irregular verbs in speech and writing.