This document discusses commonly used irregular verbs and provides examples of their usage in the present tense, past perfect tense, past imperfect tense, future tense, and future simple tense. It gives guidance on forming irregular verbs in different tenses to expand one's knowledge of English grammar.

1. Commonly used irregular verbs
Present tense

2. Commonly used irregular verbs
Past perfect tense

3. Commonly used irregular verbs
Past imperfect tense

4. Commonly used irregular verbs
Future tense

5. Commonly used irregular verbs
Future simple tense