Are all three forms of verbs always different in irregular verbs?

Yes, 'cut' is an irregular verb, and its base, simple past, and past participle verb forms are the same.

Cut -> Cut -> Cut

Example:

• I cut vegetables everyday. (Present Tense)
• Yesterday, I cut my finger while chopping vegetables. (Past Tense)
• I have cut the paper in half. (Perfect Tense)

No, modal verbs such as may, must, will, shall, can, could, would, and should are not classified as irregular verbs because modal verbs do not change their forms into past and past participle. However, the modal verbs have their separate category, known as auxiliary or helping verbs.

Example:

• Can has a past form; could, but no past participle.
• Will becomes would in reported speech.

Below are some of the most commonly used irregular verbs:

There are around 200 commonly used irregular verbs in English. However, this number may vary depending on the classification. Some of the examples of frequently used irregular verbs in everyday conversation are: Go, Do, Have, Get, Make, See, Come, Take, etc.

The verbs that do not follow a specific pattern of forming the past tense and past participle by simply adding the suffixes '-d' and '-ed' to the base verbs are known as irregular verbs. Instead, these verbs either change entirely, stay the same in V2 & V3, or follow some other unique transformations.

Example:

• Go -> Went -> Gone
• Rise -> Rose -> Risen
• Break -> Broke -> Broken