Verb Tenses

Respuesta correcta: A) walks

• A) walksCorrect! A daily habit with an exact time uses the present simple, and the subject is third person singular, so the verb takes -s.
• B) is walkingThe present continuous suggests an action happening right now or around now, not a habit repeated every single morning.
• C) walkThe base form leaves out the -s that third person singular requires, so the sentence does not agree with the subject.
• D) has walkedThe present perfect links the walk to a period up to now, which is not what a fixed daily routine expresses.

Respuesta correcta: B) went

• A) goedEnglish does not add -ed to every verb; 'go' is irregular and its past form is 'went'.
• B) wentCorrect! 'Go' is an irregular verb, so its past simple is 'went', not 'goed'.
• C) gone'Gone' is the past participle, used after have, was or been, not the simple past on its own.
• D) has goingThis mixes the auxiliary have with the bare form of go, which is not a valid past form.

Respuesta correcta: C) was cooking

• A) cookedThe past simple would make the two actions a simple sequence with no overlap; the longer action needs the continuous form.
• B) am cookingCooking here happened in the past, so the auxiliary must be the past form 'was', not 'am'.
• C) was cookingCorrect! 'While' introduces a longer action already in progress, which is the past continuous.
• D) have cookedThe present perfect links the action to the present, but the telephone rang in a finished past moment.

Respuesta correcta: D) have lived

• A) liveThe present simple would work only without since or for; with a starting date the present perfect is needed.
• B) livedThe past simple would place the action entirely in the past and suggest the living has stopped.
• C) had livedThe past perfect looks back from another past point and cannot be used with since in this meaning.
• D) have livedCorrect! 'Since' with a starting point in the past requires the present perfect.

Respuesta correcta: A) had already started

• A) had already startedCorrect! 'By the time' takes the past perfect because the film began before the moment of reaching.
• B) has already startedThe present perfect looks from the present, but the whole reference point is a past moment.
• C) already startedA bare past participle with no auxiliary is not a complete verb form in standard English.
• D) was starting'By the time' asks for the completed earlier action, and the continuous form here suggests it had not yet begun.

Respuesta correcta: B) is going to

• A) will'Will' is used for predictions made at the moment of speaking, without prior visible evidence.
• B) is going toCorrect! Visible evidence right now plus a prediction points to 'be going to'.
• C) would'Would' belongs to the past, to polite offers and to conditional structures, not to an immediate prediction.
• D) isThe future continuous describes an action in progress at a future moment, not a prediction about rain.

Respuesta correcta: C) has been working

• A) is workingThe present continuous would reset the action to now, losing the link with 'all morning'.
• B) worksThe present simple describes a habit, not an activity that began earlier and is still going on.
• C) has been workingCorrect! Present perfect continuous joins a past starting point to a still-true present result.
• D) had been workingThe past perfect continuous would look back from a past point, but the result is unfinished in the present.

Respuesta correcta: D) arrive

• A) will arriveThis is the error the rule exists to catch: a future form inside a when clause referring to the future.
• B) am arrivingThe present continuous is possible for a fixed arrangement, but not as the general rule for a future when clause.
• C) arrivedThe past simple would make the clause refer to a moment in the past, which contradicts tomorrow.
• D) arriveCorrect! English uses the present simple in a time clause that refers to the future.

Respuesta correcta: A) has

• A) hasCorrect! 'Have' is a stative verb here, so it keeps the present simple even in a sentence about a possession.
• B) is havingStative verbs such as have, know and love do not normally take the continuous in this meaning.
• C) haveThe base form does not agree with the third person singular subject 'my uncle'.
• D) has hadThe present perfect would point to an earlier acquisition whose relevance is still open, which the sentence does not express.

Respuesta correcta: B) used to play

• A) uses to playThe third person form of the negative is 'did not use to', never 'uses to'.
• B) used to playCorrect! 'Used to' marks a past habit that no longer holds.
• C) would play'Would' suggests a repeated action in a past context that can still be imagined as possible, not a habit that has ended.
• D) is used to play'Be used to' is followed by a noun or a gerund and means being accustomed to something.

Respuesta correcta: C) will have finished

• A) will finishThe future simple does not look back from the deadline; it places the action at or after it.
• B) have finishedThe present perfect looks back from now, not from next December.
• C) will have finishedCorrect! The future perfect looks forward from a future point to an action completed before it.
• D) would finish'Would' belongs to conditionals and to past habits, not to a future deadline.

Respuesta correcta: D) was writing

• A) wroteThe past simple makes both actions equally short and separate, removing the sense of interruption.
• B) has writtenThe present perfect would claim the letter is finished and relevant now, but the story closes in the past.
• C) will writeA future form cannot appear in a sequence of events that the sentence presents as already completed.
• D) was writingCorrect! The past continuous gives the interrupted background action.

Respuesta correcta: A) have already found

• A) have already foundCorrect! The result of finding the passport is still true in the present, so the present perfect fits.
• B) foundThe past simple would work with an explicit past time such as yesterday, but here no finished past time is given.
• C) had foundThe past perfect looks back from a past point, and there is no past reference point in the sentence.
• D) will findA future form contradicts the fact stated after 'so', which reports an already achieved result.

Respuesta correcta: B) are meeting

• A) meetThe present simple is used for routines and timetables, not for a personal arrangement made with friends.
• B) are meetingCorrect! The present continuous with a future time expression describes a fixed arrangement.
• C) will meet'Will' would make the meeting a spontaneous decision taken at the moment of speaking.
• D) had metThe past perfect refers to a meeting completed before a past point, which has no place in this future arrangement.

Respuesta correcta: C) Did

• A) DoDo builds the present simple, so it cannot be used with a finished past time such as last weekend.
• B) WereWere forms the passive, and this active sentence needs the ordinary do-support in the past.
• C) DidCorrect! A past simple question uses did plus the base form of the main verb.
• D) AreAre is present tense support and would ask about a present state, not about a past visit.

Respuesta correcta: D) is going to

• A) willA will prediction is made at the moment of speaking, with no earlier evidence to justify it.
• B) shallShall is used mainly in offers and suggestions such as shall we dance, not for a prediction here.
• C) isA bare is does not build a future prediction; it would need a future form such as is going to or will.
• D) is going toCorrect! The evidence is in front of the speaker, so be going to carries the warning.

Respuesta correcta: A) am visiting

• A) am visitingCorrect! A present continuous with a future time expression describes a fixed personal arrangement.
• B) visitThe bare present simple would treat the visit as a general habit rather than one arranged for this evening.
• C) visit laterThe adverb later cannot replace the verb form, so the sentence would have no finite verb at all.
• D) will visitThis is not wrong in meaning, but the continuous is the form that pairs with a definite future arrangement.

Respuesta correcta: B) was talking

• A) talkedThe past simple would reduce the speech to one finished act and destroy the sense of it continuing.
• B) was talkingCorrect! The speaking in progress belongs to the past continuous, with the question as the interruption.
• C) is talkingA present continuous cannot describe the past scene the while clause sets up.
• D) has talkedThe present perfect would push the speaking towards the present, but the whole story is placed in the past.

Respuesta correcta: C) lived

• A) has livedThe present perfect would suggest he may still live in those countries, which the present sentence denies.
• B) was livingThe past continuous would need a second past event to overlap with, and there is none here.
• C) livedCorrect! The past simple presents the repeated experience as a finished chapter of his life.
• D) had livedThe past perfect would need a past point to look back from; 'now' is not that point.

Respuesta correcta: D) changed

• A) has changedAfter a past tense verb the next verb returns to its base form; the present perfect cannot stand there.
• B) was changingThe passive or continuous form breaks the rule that a sequence of past verbs takes base forms.
• C) will changeA future form after a past verb would mix two different time references in one clause.
• D) changedCorrect! A past main verb requires the base form of the verb that comes after it.