**Rule:** The 'be going to' future is used to express a plan or intention that has already been decided. The fact that 'she's been practicing all week' is strong evidence of her prior intention to audition. Option (b) 'will audition' would suggest a spontaneous decision. Option (a) 'auditions' is the simple present, used for habits or schedules, which doesn't fit here. Option (d) 'will have auditioned' is the future perfect, indicating completion before a future point, which is not the intended meaning.

**Rule:** In conditional clauses beginning with 'unless' (which means 'if...not'), the Simple Present Tense is used to refer to a future condition. The main clause uses a future tense. Option (a) 'will work' is incorrect in the conditional clause. Option (c) 'are working' is the present continuous. Option (d) 'don't work' would create a double negative ('Unless you don't work' means 'If you work'), changing the meaning.

**Rule:** In a future time clause starting with a conjunction like 'after', the Simple Present Tense is used to refer to the future action. The main clause uses the future ('you will be'). Using a future tense like 'will finish' in the time clause is grammatically incorrect.

**Rule:** The Simple Present Tense ('departs') is the standard and most formal choice for fixed public timetables. The Present Continuous ('is departing', option b) is also very common and correct, especially in spoken English, to refer to a near-future scheduled event.

**Rule:** The Present Continuous Tense ('is/are' + verb-ing) is used to talk about fixed plans and arrangements in the near future. 'All the arrangements are made' confirms that this is a fixed plan. Option (a) is for predictions or spontaneous decisions. Option (b) is for schedules. Option (d) is future perfect.

**Rule:** The Future Continuous Tense (will be + verb-ing) is used to talk about an action that will be in progress at a specific time in the future. 'This time tomorrow' specifies the exact future moment when the action of driving will be happening. Option (d) suggests the drive will be over. Option (b) is a general future statement.

**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. 'At this time tomorrow', the action of boarding the plane will be happening. Option (d) implies the boarding is already finished.

**Rule:** The Simple Future with 'will' is used to state a future fact or an event that is certain to happen. The beginning of a new year at midnight is a certainty. The time clause 'When the clock strikes midnight' uses the simple present, and the main clause correctly uses the simple future. Option (d) is possible but 'will begin' is more common for stating the consequence.

**Rule:** The Future Perfect Continuous Tense (will have been + verb-ing) is used to emphasize the duration of a repeated action up to a specific future point. While this is a single event (the 10th anniversary), the underlying structure focuses on the decade of anniversaries being completed. 'Will have been married for ten years' would be more common, but this structure is also possible to emphasize the celebration of the duration.

**Rule:** 'Be going to' is used for predictions based on clear present evidence. If the bridge is visibly old and unstable, that evidence leads to the prediction of its collapse. It implies an imminent and observable danger. Option (d) is future perfect. Options (a) and (b) are incorrect.