The document discusses various English modal verbs and their common uses:
- Regular verbs follow a consistent pattern of adding "-ed" for the past tense and past participle, while irregular verbs do not follow a consistent pattern.
- Modal verbs like can, could, may, might, will, would, shall, should, have to, ought to, must express ideas like ability, permission, possibility, obligation and necessity.
- Each modal verb has semantic nuances, such as expressing possibility versus permission, or past versus future time frames. Examples are provided to illustrate the meanings and uses of different modal verbs.