The correct answer is 'had' because the thief's escape happened before the police arrived, and the Past Perfect tense (had + past participle) is used to mark the earlier of two past events. 'By the time' is a hallmark Past Perfect signal phrase, showing that one action was already complete when the second, later action (the police arriving) took place. This tense is essential for narrating crime and news reports where sequence matters.
The correct answer is 'had' because leaving the office occurred before another past action (reaching there), which the Past Perfect tense (had + past participle) expresses regardless of subject number. 'Before' functions similarly to 'by the time', clearly marking which past event happened first. Past Perfect has a single invariant form, 'had', for all subjects, unlike Present Perfect's have/has split based on person and number.
The correct answer is 'had been' because the studying was an ongoing activity that continued right up until another past moment (my arrival), which requires the Past Perfect Continuous tense (had been + verb-ing). This tense combines the 'earlier than another past event' logic of Past Perfect with the emphasis on duration from the continuous aspect. 'For two hours' expresses that duration, while 'before I arrived' anchors the later reference point in the past.
The correct answer is 'had been' because the plural subject 'they' had been engaged in an ongoing activity (playing) that continued until a specific past event interrupted it (the rain starting), matching the Past Perfect Continuous pattern had been + verb-ing. 'Since morning' marks the starting point of the activity, while 'before it started raining' marks the later past reference. This tense is invariant in form regardless of subject number.
The correct answer is 'will' because 'tomorrow morning' refers to a spontaneous or straightforward future intention, which is expressed using the Simple Future tense (will + base verb). Simple Future is the default choice for predictions, promises, and decisions made at the moment of speaking, unlike 'shall have' (a perfect construction) or 'was going to' (a past intention that may not have been carried out). 'Will' remains the most common and neutral future marker in modern English.
The correct answer is 'will' because 'next week' signals a future action, and simple future intentions or plans are expressed using 'will' + base verb. Although 'shall' was historically used with I/we in formal British English, modern usage strongly favors 'will' across all subjects. This sentence expresses a straightforward future plan rather than an obligation or formal offer, both of which sometimes still use 'shall' in older or more formal registers.
The correct answer is 'will' because 'tomorrow' points to a future event, and the Simple Future tense (will + base verb) is used for future plans or arrangements stated plainly. 'Shall be' is grammatically unusual outside very formal contexts and doesn't fit naturally here, while 'would have' belongs to conditional or reported speech structures, not straightforward future statements. 'Will' remains the standard, versatile choice for expressing future actions in everyday and exam English.
The correct answer is 'will' because the sentence makes a straightforward future prediction about arrival time, which the Simple Future tense (will + base verb) is designed to express regardless of the plural subject 'they'. Unlike some other tenses, 'will' does not change form based on subject number, making it one of the simpler auxiliary verbs to apply correctly. 'By evening' sets the future time frame without requiring the more complex Future Perfect construction, since no specific deadline completion is being emphasized.
The correct answer is 'will' because the sentence expresses a future action or decision (joining for dinner tonight), which fits the Simple Future tense (will + base verb). 'Was going' would suggest a plan that existed in the past and may not have happened, while 'would have' belongs to hypothetical past conditionals, neither of which matches a straightforward future statement. 'Tonight' confirms this is a future-oriented sentence requiring 'will'.
The correct answer is 'will' because the speaker is making a confident prediction about future weather, and predictions are one of the core uses of the Simple Future tense (will + base verb). 'I am sure' reinforces the predictive, confident tone typical of 'will' statements. This differs from 'was going to', which implies a plan formed in the past, making 'will' the natural choice for spontaneous predictions about tomorrow.
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