: When we have to do something because we believe that it is the best choice for us, we use …, When we have to do something because somebody else urges us to do it or makes us do it, we use …, When we have to do something because there’s some agreement, not necessary verbalized, we use …, When we have to do something because otherwise we’ll be punished, we use …, When the obligation is in the past, we use…, When the obligation is in the future, we use…, When the obligation (plan) in the past was not carried out, we use…, When we discuss some necessity in the present, we use…, When we discuss lack of necessity in the present, we use…, When we discuss an action performed in vain, we use…, When we ask about some necessity and hope to get a negative answer, we use…, When we want to give advice to a close friend, we use…, While writing an instruction to a medicine, we use…, When we mean that something that happened was our destiny, we use…,

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