**Rule:** The Future Continuous Tense (will be + verb-ing) is a common way to talk about a planned event or a general state of affairs during a future period ('next year'). It describes the celebration as an ongoing event throughout that time. Option (d) is also correct for a planned event. Option (c) is future perfect.

**Rule:** The Future Perfect Passive voice (will have been + past participle) is required. The 'preparations' are the object of the action 'to make'. The action will be completed by a specific future time ('by the time the ceremony begins'). Option (a) is active. Option (c) is future continuous active. Option (d) is simple present passive.

**Rule:** The Future Perfect Tense (will have + past participle) is used to show that a future action will be completed before another future action happens. The escaping will be finished before the police arrive. Option (d) would mean they are in the process of escaping when the police arrive.

**Rule:** 'Be going to' is used to make a prediction based on clear present evidence. The 'mess' is the evidence that leads to the logical prediction about the mother's future reaction. Option (b) 'won't be' is also a possible prediction, but 'isn't going to be' connects more strongly to the visible, present evidence.

**Rule:** The Simple Future Tense ('will' + base verb) is used to state a future fact or prediction. The sentence is a simple statement about a future state of being. 'In two days' specifies the future time. Option (b) is future perfect. Options (c) and (d) are grammatically incorrect in this context.

**Rule:** The Simple Future with 'will' is used for a spontaneous decision made at the moment of speaking. The feeling of exhaustion leads to the immediate decision to take a break. Option (c) would imply a prior plan to take a break, which is less likely than a spontaneous reaction to feeling tired.

**Rule:** The 'be going to' form is used for predictions when there is present evidence for the future event. The 'dark clouds' are clear evidence that rain is imminent. Option (a) 'will rain' is used for predictions without present evidence or for spontaneous decisions. Option (c) 'rains' is Simple Present. Option (d) 'will have rained' (Future Perfect) is incorrect as it refers to a completed action in the future.

**Rule:** The Future Perfect Continuous Tense (will have been + verb-ing) is used to emphasize the duration of an action up to a specific point in the future. The duration is 'for twenty-five years', and the future point is 'Next month'. This tense perfectly captures the long service.

**Rule:** The Present Continuous Tense ('is/are' + verb-ing) is frequently used to talk about personal arrangements and fixed plans for the near future. The speaker has a pre-arranged plan to visit their grandparents. Option (b) would suggest a spontaneous decision, which is less likely in this context. Options (c) and (d) are incorrect.

**Rule:** The Future Simple Passive ('will be' + past participle) is needed because the 'law' is the object of the action 'to pass'. This structure is used for formal announcements and predictions about future events where the focus is on the action, not the agent. Option (a) is active. Option (b) is future perfect active. Option (d) is simple present active.