In particular, they MUST only be used where it is actually required for interoperation or to limit behavior which has potential for causing harm (e.g., limiting retransmisssions) For example, they must not be used to try to impose a particular method on implementors where the method is not required for interoperability. 7.
Must. 'Must' is the basic and most direct way of saying something is compulsory. It means you have no choice but to do (or not do) an action. We can only use 'must' in the present form to describe a general or permanent obligation, or an obligation in the near future.
Must is not an ordinary English verb. It's a Modal Auxiliary Verb, which are very irregular.. One of the strange facts about modal auxiliaries is that they always have at least two kinds of meaning. One use of modals (like must, should, or may) is called the Deontic sense, and it always deals with social permissions and obligations. All of the following are deontic, and have to do with what The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119. Without support for meta transactions in the recipient contract, an externally owned account can not use meta While questions with "must" are grammatically correct, it is more usual nowadays to use "have to" for questions. There is no past form of must for obligation: We had to show our passports at the border. We weren't allowed to use calculators in the exam. Or, we couldn't use calculators in the exam.

At every stage climate action must stride forward side-by-side with human development, dignity and opportunities for all. We've heard the concerns from Samoa and all island states. Island States made it clear from the floor that this consensus does not go far enough to protect their populations and the planet. The fact they received the

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    • use of must and must not