**Rule:** The Future Continuous Tense (will be + verb-ing) is used to describe an action that will be in progress over a period of time in the near future. It explains why she is unavailable now. The preparation is an ongoing process. Option (d) means the preparation is finished. Options (b) and (c) are incorrect.

**Rule:** The 'be going to' structure is used for predictions based on present evidence or feelings. 'I feel terrible' is the present evidence that leads to the prediction of becoming sick. Option (a) 'will be' is also possible, but 'am going to be' is more idiomatic when the evidence is a current physical sensation. Options (b) and (d) are incorrect.

**Rule:** The Future Perfect Tense (will have + past participle) is used to talk about an action that will be completed by a specific time in the future. 'In five years' sets the deadline by which the action of paying off the mortgage will be finished. Option (a) suggests the action will still be in progress, not completed.

**Rule:** This sentence requires the Future Perfect Passive voice (will have been + past participle). The subject ('bridge') is the receiver of the action. The action will be completed ('built') by a specific future time ('By this time next year'). Option (a) is active. Option (b) is future continuous active. Option (c) is simple present passive.

**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. 'For a whole year' specifies the duration, and 'next week' is the future point when this duration will be completed. Option (a) would mean that next week we will be in the process of living here, but it doesn't emphasize the completed duration.

**Rule:** The Future Perfect Tense (will have + past participle) is needed here to express an action that will be fully completed before another future event. The action is 'packing the collection', and the future event is 'he moves house'. The packing will be finished before the moving. Option (d) implies the packing will be in progress during the move.

**Rule:** In future time clauses introduced by conjunctions like 'after', 'when', or 'before', the Simple Present Tense is used, not a future tense. The action of finishing homework must happen before the action of calling, so the simple present 'finish' is correct. Option (a) 'will finish' is a common error. Options (b) and (d) are also grammatically incorrect in this structure.

**Rule:** The Simple Present Tense is used for facts of nature or events on a fixed, predictable schedule. The sunrise is a natural event that happens on a regular, timetabled basis. Therefore, 'rises' is the correct form. While (d) is not incorrect, (c) is the standard tense for such events.

**Rule:** The Future Continuous Tense (will be + verb-ing) is used to describe an action that will be in progress at a specific time in the future. The phrase 'This time next week' specifies an exact future moment. The action of relaxing will be ongoing at that point. Option (a) 'will relax' (Simple Future) states a future action but not its continuous nature at a specific time. Option (b) 'am relaxing' is Present Continuous and incorrect here. Option (c) 'will have relaxed' (Future Perfect) implies the action of relaxing will be completed by that time, which is not the intended meaning.

**Rule:** The 'be going to' future is used for predictions based on clear present evidence. The 'strange noise' is the auditory evidence that leads to the logical prediction that the car will break down. Option (a) is a more general prediction, not as strongly linked to the current evidence.