**Rule:** The Simple Future with 'will' is used to state a future fact or a scheduled event that is not part of a personal plan. This is a statement about how the software is programmed to behave in the future. Option (b) would imply a personal arrangement. Option (a) is for fixed timetables. Option (d) is present perfect.

**Rule:** The question asks about the duration of an action up to a specific point in the future, which requires the Future Perfect Continuous Tense (will have been + verb-ing). 'By the time you move to London' sets the future point. Option (a) 'will you be studying' (Future Continuous) asks if the action will be in progress at that time, not about its duration. Options (b) and (d) are present tenses.

**Rule:** The Simple Future with 'will' is used for making promises. The speaker is promising to call in the future. The time clause 'as soon as I have any news' correctly uses the simple present. Option (d) is for prior plans, but this sounds more like a promise made now.

**Rule:** When asking about future events that are part of a fixed schedule or timetable, it is common to use the Simple Present Tense. The structure is 'What time does [subject] start?'. Option (c) 'is...starting' is also very common and correct for asking about future arrangements. Option (b) is future continuous. Option (d) is future perfect.

**Rule:** Both Simple Present ('leaves') and Present Continuous ('is leaving') can be used for future events that are part of a fixed schedule or timetable. The simple present is very common for transport schedules. Present continuous is also correct as it refers to a fixed personal arrangement. However, for official timetables, simple present is the most standard choice.

**Rule:** The Simple Future with 'will' is used to express an opinion, belief, or prediction, especially after verbs like 'I think'. The speaker is giving their opinion on a future appearance. Option (c) is also possible, but 'will' is the most common choice for expressing such personal opinions.

**Rule:** The Simple Future with 'will' is used to express beliefs or predictions about the future, especially distant ones. It's the standard choice after verbs like 'believe', 'think', and 'expect'. Option (c) is also for predictions but often based on more immediate evidence. Option (a) is present continuous. Option (d) is future perfect.

**Rule:** The Future Continuous Tense (will be + verb-ing) can be used to talk about planned future events, similar to the Present Continuous. It suggests that the exhibition is a confirmed plan. Both 'is exhibiting' and 'will be exhibiting' are correct for future plans, but the latter is offered as an option here. Option (a) is for schedules, which is less likely for an art exhibition. Option (c) is past tense.

**Rule:** The Present Continuous Tense ('is/are' + verb-ing) is used to talk about definite future plans and arrangements. A politician's campaign is a planned series of events. 'is going to run' would also be correct. Option (b) is for habits. Option (c) is future perfect. Option (d) is past.

**Rule:** The Future Continuous Tense (will be + verb-ing) is often used to ask about someone's plans for a specific future time in a polite and indirect way. It's less direct than asking 'Are you going to watch?'. Option (d) is future perfect. Options (b) and (c) are incorrect tenses.