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Modal Verbs and Phrases 

Modal auxiliary verbs and related phrases are used to convey the speaker’s attitude toward events, including obligation, necessity, advice, ability, deduction, possibility, permission, and prohibition. To express obligation or necessity, we use must or have got to for strong personal obligations, and have to or be required to when the obligation comes from an external authority. Negative obligations or prohibitions are expressed with mustn’t or can’t, while lack of necessity is indicated by needn’t, don’t need to, or didn’t need to. Needn’t have refers to actions that were done unnecessarily, often indicating regret. Related verbs like be required to and be obliged to also refer to external rules or authority.

For recommendation and advice, verbs such as should, ought to, or had better express advisable actions, with might or could showing probable but unfulfilled actions. The verb be supposed to is used to indicate what should happen according to rules or expectations.

In terms of ability and willingness, can and be able to express general ability, with could and past forms showing past abilities. Specific past actions are described using was able to or managed to. Conditional ability uses could, while willingness is expressed with will or would, and unwillingness with won’t or wouldn’t.

For deduction and possibility, must, can’t, and might express logical conclusions; could, may, or might indicate possible actions, and modifiers like very well, even, or just adjust the strength of the possibility. Negative possibilities are expressed with may not or might not. Related verbs include be likely to and be bound to.

Regarding permission, can and could are used to ask for or grant permission, with could often considered more polite. Prohibition is expressed using mustn’t, can’t, and couldn’t, and related verbs like not allowed or forbidden indicate restrictions imposed by rules or authority.

Overall, modal verbs and phrases allow speakers to express a range of attitudes, from necessity and advice to possibility, permission, and prohibition, and their use depends on context, time, and the source of obligation or authority.