Present Perfect

Respuesta correcta: B) She has visited San Miguel three times.

• A) She have visited San Miguel three times.The auxiliary must agree with 'she': it is 'has', not 'have'.
• B) She has visited San Miguel three times.Auxiliary 'has' plus past participle, the correct present perfect structure.
• C) She has visit San Miguel three times.After 'has' the second verb must be the past participle 'visited'.
• D) She visiting San Miguel three times.A gerund alone cannot form the present perfect.

Respuesta correcta: C) have never eaten

• A) have never eatThe verb after 'have' must be the past participle 'eaten'.
• B) am never eatingPresent continuous cannot express a life experience without a specific time.
• C) have never eaten'Have' plus participle 'eaten' matches the life-experience use of the present perfect.
• D) never ateSimple past implies a definite past time, which 'before' here does not fix.

Respuesta correcta: A) Have

• A) Have'Have you ever been...?' is the standard present perfect question about experience.
• B) Did'Did you ever go...?' would ask about a specific finished past event.
• C) Are'Are' cannot be the auxiliary of a past participle such as 'been'.
• D) Do'Do you ever go...?' speaks about a habit, not about a life experience.

Respuesta correcta: C) have

• A) has'Has' goes with he/she/it; with 'you' it would be incorrect.
• B) are'Are' plus 'seen' would produce an invalid structure.
• C) haveSubject 'you' takes 'have' plus the past participle 'seen'.
• D) did'Did' belongs to the simple past and would need the base form 'see'.

Respuesta correcta: B) They have already finished the assignment.

• A) They have already finish the assignment.After 'have' the participle 'finished' is required, not the base form.
• B) They have already finished the assignment.'Have' + participle, with the present perfect marker 'already'.
• C) They already have finish the assignment.The adverb sits between the auxiliary and the verb, not before the whole phrase.
• D) They are already finished the assignment.'Are' + participle is not a valid combination for this meaning.

Respuesta correcta: C) He has not received my message.

• A) He has not receive my message.The participle 'received' is needed after 'has not'.
• B) He not has received my message.The auxiliary must precede the adverb 'not' in English.
• C) He has not received my message.'Has not' plus participle 'received' is the correct negative.
• D) He does not received my message.The present perfect requires 'has not', not 'does not'.

Respuesta correcta: D) I have brushed my teeth, so I can sleep now.

• A) I brushed my teeth, so I can sleep now.Simple past is acceptable only with a definite past time; here the result is what matters.
• B) I am brushing my teeth, so I can sleep now.Present continuous would be unusual as a completed preparatory action.
• C) I will brush my teeth, so I can sleep now.Future tense reverses the order of cause and effect.
• D) I have brushed my teeth, so I can sleep now.The past action explains a present consequence, which is exactly the present perfect.

Respuesta correcta: A) have not yet finished

• A) have not yet finishedPlural subject plus 'have not' plus participle 'finished', with 'yet' in the middle.
• B) have not yet finishThe verb must be the past participle after 'have not'.
• C) did not yet finish'Did' would require the base form and a past time reference.
• D) are not yet finishingPresent continuous cannot express the completion of the report.

Respuesta correcta: B) He has lived in Apaneca since 2019.

• A) He lives in Apaneca since 2019.'Since' is incompatible with the present simple; the action started in the past.
• B) He has lived in Apaneca since 2019.'Since' + year with 'has lived' is the standard ongoing situation pattern.
• C) He lived in Apaneca since 2019.Simple past with 'since' is wrong because the situation continues into the present.
• D) He is living in Apaneca since 2019.Present continuous cannot be combined with 'since' in this usage.

Respuesta correcta: D) I have arrived since yesterday.

• A) She has gone to Berlin twice.Present perfect with a countable experience and 'twice' is correct.
• B) We have known each other for ten years.'For' plus duration with the present perfect is correct.
• C) They have just left the building.'Just' is a present perfect marker, so the form is correct.
• D) I have arrived since yesterday.'Since' with a finished past moment requires the simple past: 'I arrived yesterday'.

Respuesta correcta: C) Has he finished the report yet?

• A) Is he finished the report yet?'Is' cannot be combined with the participle 'finished' in this structure.
• B) Did he finished the report yet?'Did' requires the base form 'finish' and belongs to the simple past.
• C) Has he finished the report yet?Auxiliary 'has' before the subject and the participle 'finished' with 'yet'.
• D) Does he finish the report yet?'Does' plus base form is the present simple, not the present perfect.

Respuesta correcta: B) has gone

• A) has goThe second verb must be the past participle 'gone'.
• B) has gone'Has gone' expresses a past movement whose result is still true: she is not here now.
• C) would goConditional form does not match the inference from the present situation.
• D) is goingPresent continuous would place her on the way there right now.

Respuesta correcta: D) He has been studying for three hours.

• A) He is studying since three hours.'Since' needs a starting point, not a duration, and cannot follow 'is studying'.
• B) He studies for three hours.Simple present plus 'for' describes a habit, not an action in progress.
• C) He had studied for three hours.Past perfect places the whole action before another past moment.
• D) He has been studying for three hours.'Has been studying' marks a duration that started in the past and still continues.

Respuesta correcta: A) have

• A) have'Have you been working...?' is the present perfect progressive question.
• B) did'Did you work here?' asks about a finished past period.
• C) do'Do you work here?' speaks about the current job in general, not about its duration.
• D) are'Are you working here?' is a temporary present state without duration.

Respuesta correcta: A) The speaker still lives there.

• A) The speaker still lives there.The action started in the past and has not stopped, so it is still true today.
• B) The speaker lived there for a while and then left.That meaning would require the past simple or the past perfect.
• C) The speaker will move there next year.Nothing in the sentence refers to the future.
• D) The speaker has never lived anywhere else.The sentence does not mention any other place.

Respuesta correcta: B) write - written

• A) work - workedA regular verb: the participle keeps the stem and adds -ed.
• B) write - writtenThe stem vowel changes from 'i' to 'i' with the ending '-written', an irregular participle.
• C) play - playedRegular verb: the past and the participle end in -ed.
• D) open - openedRegular verb: the participle is formed with -ed.

Respuesta correcta: C) We have studied English for six years.

• A) We have studied English since six years.'Since' cannot be followed by a duration; it needs a date or a starting event.
• B) We study English for six years.Simple present plus 'for' describes an established habit, not the accumulated time.
• C) We have studied English for six years.'For' + period of time is the correct combination with the present perfect.
• D) We are studying English since six years.Present continuous cannot be combined with 'since' here.

Respuesta correcta: D) ate

• A) have eatenPresent perfect with 'last year' would be contradictory; the time is already closed.
• B) am eatingPresent continuous places the action now, but the text says 'last year'.
• C) had eatenPast perfect would require another past reference point, which is absent here.
• D) ate'Ate' is the simple past of 'eat', and 'last year' requires a finished past tense.

Respuesta correcta: D) It shows the action was completed sooner than expected.

• A) It shows the action will happen in the future.'Already' points to a completed past action, not to the future.
• B) It shows a repeated action in the past.Repetition is expressed by 'every', 'usually' or similar frequency adverbs.
• C) It shows the action is happening right now.That is the function of the present continuous, not of 'already'.
• D) It shows the action was completed sooner than expected.'Already' marks completion before the expected moment, a typical present perfect use.

Respuesta correcta: A) The results have not been published yet.

• A) The results have not been published yet.Passive present perfect: 'have not been' plus participle 'published'.
• B) The results have not published yet.The subject 'the results' cannot publish themselves; the passive is required.
• C) The results not have been published yet.The auxiliary must precede the adverb 'not'.
• D) The results has not been published yet.Plural 'results' requires 'have', not 'has'.