Present Perfect Experiences

Respuesta correcta: A) She has visited Paris twice.

• A) She has visited Paris twice.Correct. 'Has visited' is present perfect, and the sentence does not say when the trip happened, only that it has happened.
• B) She visited Paris twice.Incorrect. The past simple sounds fine, but the unit calls for the present perfect for an experience with no specific date.
• C) She has visit Paris twice.Incorrect. After 'has' the verb goes in the past participle, and the participle of 'visit' is 'visited'.
• D) She is visited Paris twice.Incorrect. The present continuous does not combine with a place, and the main verb would also be wrongly conjugated.

Respuesta correcta: C) haven't decided

• A) haven't decideIncorrect. After 'haven't' the verb goes in the past participle, not in its base form 'decide'.
• B) didn't decideIncorrect. The past simple negative uses 'didn't' with the base form 'decide', not with the participle 'decided' used here.
• C) haven't decidedCorrect. The present perfect negative is 'have not' or 'haven't' plus the past participle 'decided'.
• D) don't decidedIncorrect. 'Don't' belongs to the present simple and cannot be followed by a past participle.

Respuesta correcta: B) have written

• A) have wroteIncorrect. 'Wrote' is the past simple and cannot be used as a participle after 'have'.
• B) have writtenCorrect. The participle of 'to write' is 'written', which is irregular and different from the past simple form 'wrote'.
• C) have writedIncorrect. Adding -ed to an irregular verb is not valid English, so the correct form is 'written'.
• D) am wroteIncorrect. 'Am' belongs to the present continuous and does not combine with the past simple 'wrote' as the main verb.

Respuesta correcta: D) Have you ever eaten roasted pig on the beach?

• A) Did you ever ate roasted pig on the beach?Incorrect. After 'did' the verb goes in the base form, so 'ate' does not belong and the sentence is incorrect.
• B) Have you ever eat roasted pig on the beach?Incorrect. The present perfect requires the participle 'eaten', not the base form 'eat'.
• C) Do you ever ate roasted pig on the beach?Incorrect. 'Do' is the present simple auxiliary and cannot be followed by the past form 'ate'.
• D) Have you ever eaten roasted pig on the beach?Correct. 'Ever' goes between the auxiliary and the participle to ask about a life experience.

Respuesta correcta: D) 'Yesterday' is a finished past time, so the present perfect cannot be used with it.

• A) 'Yesterday' is a plural word, so the verb needs the -s of the third person.Incorrect. 'Yesterday' is a time adverb and has nothing to do with verb agreement.
• B) The present perfect always requires the past simple in the second half of the sentence.Incorrect. The two forms cannot be mixed in the same sentence when one of them requires a specific finished time.
• C) 'Seen' is not the correct participle of the verb 'to see'.Incorrect. 'Seen' is the correct participle; the problem is the time expression 'yesterday'.
• D) 'Yesterday' is a finished past time, so the present perfect cannot be used with it.Correct. The past simple requires a specific finished time, while the present perfect can only refer to the past without saying when.

Respuesta correcta: B) has just finished

• A) has just finishIncorrect. The main verb must be in the past participle, so 'finish' is missing the -ed.
• B) has just finishedCorrect. 'Just' goes between the auxiliary and the participle and shows that the action finished very recently.
• C) just has finishedIncorrect. The adverb goes in mid-position, after the auxiliary, not at the beginning of the sentence.
• D) has finish justIncorrect. The order is auxiliary, adverb, participle; putting 'just' at the end breaks the present perfect structure.

Respuesta correcta: A) have waited

• A) have waitedCorrect. 'Have waited' is present perfect, and 'for' with a duration is compatible with this tense.
• B) have been waitingIncorrect. That gerund belongs to the present perfect continuous, which is a different unit with a different emphasis.
• C) had waitedIncorrect. 'Had' is the past perfect, which places the waiting at a point before another past event.
• D) are waitingIncorrect. The present continuous is used with ongoing durations, but here the sentence reports a result that is already complete.

Respuesta correcta: C) haven't you

• A) didn't youIncorrect. 'Didn't' belongs to the past simple and does not fit the present perfect structure.
• B) have you notIncorrect. A positive statement requires a negative tag, so the 'not' in the tag is unnecessary.
• C) haven't youCorrect. A positive statement takes a negative tag, and the auxiliary 'have' is kept with the subject 'you'.
• D) don't youIncorrect. 'Don't' is the present simple auxiliary, not the present perfect one.

Respuesta correcta: C) since

• A) forIncorrect. 'For' measures a duration, and 'was a child' is a point in time, not a measurable period.
• B) duringIncorrect. 'During' is used with specific periods such as 'during 2020' or 'during the summer'.
• C) sinceCorrect. 'Since' introduces a starting point in time, and 'was a child' is a specific moment that works as that point.
• D) fromIncorrect. 'From' indicates an origin or starting point, but it does not combine with the present perfect the way 'since' does.

Respuesta correcta: A) Have

• A) HaveCorrect. The auxiliary 'have' opens the present perfect question, and the verb goes in the participle, which is 'been'.
• B) DoIncorrect. 'Do' forms present simple questions and does not combine with 'been', which is a participle.
• C) DidIncorrect. 'Did' belongs to the past simple and would require the base form 'be' after the auxiliary.
• D) AreIncorrect. 'Are' opens a question with 'to be' in the present, not a present perfect question, which requires 'been'.

Respuesta correcta: D) I have finished my homework last night.

• A) I have finished my homework already.This sentence is correct, because 'already' is a present perfect marker.
• B) I have finished my homework at nine o'clock.Incorrect. An exact time also marks a finished past, so the sentence should use 'finished' in the past simple.
• C) I have just finished my homework.This sentence is correct, because 'just' is typical of the present perfect.
• D) I have finished my homework last night.Correct. This is the incorrect sentence: 'last night' is a finished past time and requires the past simple.

Respuesta correcta: B) has never been

• A) has never beIncorrect. The auxiliary is followed by the participle 'been', not the base form 'be'.
• B) has never beenCorrect. The participle of 'to be' is 'been', and with 'he' the auxiliary is 'has', followed by 'never'.
• C) have never beenIncorrect. 'Have' agrees with I, you, we and they, and the subject of the sentence is 'he', in the third person.
• D) was never beenIncorrect. 'Was' is the past simple of 'to be' and is not the present perfect auxiliary.

Respuesta correcta: B) has given

• A) has gaveIncorrect. 'Gave' is the past simple and does not work as a participle after 'has'.
• B) has givenCorrect. The irregular participle of 'to give' is 'given', and with 'the teacher' the auxiliary is 'has'.
• C) have givenIncorrect. 'Have' does not agree with the third-person singular subject 'the teacher'.
• D) has givedIncorrect. 'Gived' does not exist in English, because 'to give' is a fully irregular verb.

Respuesta correcta: D) Yes, I have.

• A) Yes, I did.Incorrect. 'Did' answers a past simple question, not one formed with 'have'.
• B) Yes, I have submitted.Incorrect. It is a valid answer but not a short one; the short form leaves out the participle.
• C) Yes, I submitted.Incorrect. 'Submitted' is past simple and does not match the question with the auxiliary 'have'.
• D) Yes, I have.Correct. The short answer repeats the auxiliary 'have' from the question, which is the expected form.

Respuesta correcta: C) He has worked at the hospital for five years.

• A) He has worked at the hospital since five years.Incorrect. 'Since' is not used with a period of time: it needs a starting point, such as 'since 2019'.
• B) He has worked at the hospital for 2019.Incorrect. A year is a starting point, not a duration, so the correct preposition would be 'since'.
• C) He has worked at the hospital for five years.Correct. 'For' measures duration and is followed by a period of time, such as 'five years' or 'two months'.
• D) He has worked at the hospital since five years ago.Incorrect. 'Since five years ago' mixes a point in time with a duration; the natural English structure is 'for five years'.

Respuesta correcta: A) A situation that started in the past and is still true now.

• A) A situation that started in the past and is still true now.Correct. The present perfect with 'since' describes a situation that began in the past and continues into the present.
• B) A completed action with a specific date.Incorrect. With a finished date, the present perfect would be replaced by the past simple, as in 'He lived there in 2019'.
• C) A future plan that has been decided.Incorrect. The present perfect with 'since' does not express future plans; it describes a situation that has already started and is still true now.
• D) A habitual action that happened repeatedly.Incorrect. Habitual actions are expressed with the present simple, not with 'has lived'.

Respuesta correcta: A) haven't finished

• A) haven't finishedCorrect. 'Yet' goes at the end of the sentence and fits the present perfect negative to show that something has not happened.
• B) didn't finishedIncorrect. It mixes the past simple with the participle, and 'yet' also calls for the present perfect.
• C) don't finishedIncorrect. 'Don't' is present simple and cannot be followed by the participle 'finished'.
• D) haven't finishIncorrect. After the auxiliary you need the past participle 'finished', not the base form 'finish'.

Respuesta correcta: D) Have

• A) DidIncorrect. 'Did' belongs to the past simple and would require the base form 'see' after the auxiliary.
• B) DoIncorrect. 'Do' forms the present simple and does not combine with the participle 'seen'.
• C) HasIncorrect. 'Has' is for the third person singular, and the subject of the question is 'you'.
• D) HaveCorrect. With 'you' the auxiliary is 'have', and the irregular participle of 'to see' is 'seen'.

Respuesta correcta: B) bought

• A) has buyedIncorrect. 'Buyed' does not exist in English; the present perfect requires the irregular participle 'bought', not a form made with -ed.
• B) boughtCorrect. 'Last week' refers to a finished past, so it takes the irregular past simple 'bought', not the present perfect.
• C) buyedIncorrect. 'Buyed' does not exist in English, because 'to buy' is irregular and its past form is 'bought'.
• D) boughtedIncorrect. You do not add -ed to an irregular verb; 'bought' is already the complete past simple form.

Respuesta correcta: C) I haven't seen him since Monday.

• A) I haven't seen him since Monday ago.Incorrect. 'Ago' does not combine with 'since', because 'since Monday' already sets the starting point.
• B) I didn't see him since Monday.Incorrect. 'Since' requires the present perfect; with 'did', the sentence would need 'until' or a finished time reference.
• C) I haven't seen him since Monday.Correct. 'Since' with a specific day marks the starting point, so it calls for the present perfect.
• D) I haven't see him since Monday.Incorrect. After 'haven't' the verb takes the participle, so 'see' must be 'seen'.