6) Changing 'tomorrow' to 'the following day' leads to 'would have to'.
7) Not changing 'now' means there is no need to use time backshift, so "must" is the best choice.
8) It is similar to 7, but there are two possible answers: 'must' and 'wil have to'. Mostly, the model answer will be 'will have to' because it is preferred, especially when talking about obligations at a particular point in the future
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