It also shows that there is the possibility that something may happen. It indicates the permission to do something. This is a modal verb which has a double purpose. This is a powerful verb and is often used to imply a problem. However, the implication is offered that there is a reason for not having done what is required. ‘Could’ is a modal verb that indicates the ability is there to complete an action. I ought to go to the bank to pay my fees, but I have a bad cold. The slight difference between the two modal verbs is that ‘ought to’ implies slightly less of an obligation than ‘should’. I should pay my fees, but I have not gotten around to doing it. The connective ‘but’ often links the clauses. Usually, a phrase, clause or sentence will explain why the action has not yet been completed. There could be many reasons why that obligation has not been enacted. When the modal verbs ‘should’ or ‘ought to’ are used it indicates that there is a requirement to carry out an action, but it has yet been completed. I would pay my student fees if I had the money in my account. The phrase including the modal verb will be followed by a connective such as ‘if’. It is possible that the action will take place, but another condition has to be met. The modal verb ‘would’ indicates a condition. When the modal verb ‘will’ is used, that means that the action is certain to take place. This verb is used when the certainty that something will be done is to be communicated. To show obligation – a requirement to do something.
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