Conditionals

Respuesta correcta: D) If you boil water, it evaporates.

• A) If you had boiled water, it would have evaporated.That is the third conditional, describing an unreal past situation.
• B) If you boil water, it would evaporate.That is the first conditional, describing a possible future event.
• C) If you would boil water, it evaporates.'Would' after 'if' does not belong to the zero conditional.
• D) If you boil water, it evaporates.'If' plus present plus present states a general truth.

Respuesta correcta: D) rains

• A) will rain'Will' belongs to the main clause, not to the 'if' clause here.
• B) is rainingThe present continuous suggests a current temporary situation.
• C) rainedThe simple past in the 'if' clause points to the third conditional.
• D) rains'If it rains' plus 'will be postponed' is the standard first conditional.

Respuesta correcta: C) If I studied medicine, I would work in a rural clinic.

• A) If I study medicine, I would work in a rural clinic.That is the first conditional structure, not the second.
• B) If I studied medicine, I will work in a rural clinic.'Will' does not belong to the second conditional's main clause.
• C) If I studied medicine, I would work in a rural clinic.'If' plus past simple plus 'would' base is the second conditional.
• D) If I would study medicine, I work in a rural clinic.'Would' cannot follow 'if' in this pattern.

Respuesta correcta: D) If she had taken the train, she would have arrived on time.

• A) If she takes the train, she would have arrived on time.That mixes the first conditional's 'if' clause with the third's main clause.
• B) If she had taken the train, she will have arrived on time.'Will have' does not belong to the third conditional.
• C) If she would have taken the train, she would have arrived on time.'Would have' cannot open the 'if' clause of the third conditional.
• D) If she had taken the train, she would have arrived on time.'Had taken' plus 'would have arrived' is the third conditional.

Respuesta correcta: B) were

• A) am'Am' is the simple present of 'to be' and does not fit the hypothetical structure.
• B) were'Were' is the standard form in the second conditional for every person.
• C) was'Was' goes with he, she and it, but 'I' takes 'were' in this conditional.
• D) will be'Will be' does not appear in the 'if' clause of the second conditional.

Respuesta correcta: C) The first is a likely future possibility; the second is hypothetical

• A) Both express the same probabilityThe two conditionals differ precisely in how likely they consider the situation.
• B) The first refers to the past and the second to the presentThe third conditional, not the second, deals with the past.
• C) The first is a likely future possibility; the second is hypotheticalThe distinction is real likelihood against an imagined situation.
• D) The second is used only in questionsBoth conditionals appear in statements and in questions.

Respuesta correcta: B) I wish I had studied medicine.

• A) I wish I would study medicine.'Would' plus base form expresses a future wish, not past regret.
• B) I wish I had studied medicine.'Wish' plus past perfect expresses regret about a past action.
• C) I wish I have studied medicine.The present perfect does not combine with 'wish' for past regret.
• D) I wish the medicine will be studied.That structure does not express the standard regret pattern.

Respuesta correcta: A) 'If' plus 'will' is incorrect; it should be 'If it snows'

• A) 'If' plus 'will' is incorrect; it should be 'If it snows'The 'if' clause of the first conditional uses the present simple.
• B) Nothing is wrong with the sentenceSome informal speech allows it, but the standard school form excludes 'will' after 'if'.
• C) 'Stay' must be 'stayed''Will stay' is the correct form for the main clause.
• D) 'Snow' must be 'snowed'The verb must be in the present simple without the -ed ending.

Respuesta correcta: B) had left

• A) leftThe simple past in the 'if' clause would not express the unreal condition properly.
• B) had left'Had left' is the past perfect required in the third conditional's 'if' clause.
• C) would leave'Would' cannot appear in the 'if' clause of the third conditional.
• D) have leftThe present perfect refers to the present, not to an unreal past condition.

Respuesta correcta: C) A hypothetical result that may not happen

• A) A certain future eventCertainty would require the first conditional with 'will'.
• B) A past eventThe conditional is oriented to the present, not to the past.
• C) A hypothetical result that may not happen'Would' marks the consequence of an imagined condition.
• D) An obligationObligation would be expressed with 'must' or 'should'.

Respuesta correcta: A) The zero conditional, because it states a general truth

• A) The zero conditional, because it states a general truth'If' plus present plus present expresses an always valid rule.
• B) The first conditional, because it refers to the futureNo future time appears in the sentence.
• C) The second conditional, because it is hypotheticalThe second conditional describes an unreal present situation.
• D) The third conditional, because it refers to the pastNo past event appears in the sentence.

Respuesta correcta: B) Unless you register early, you will not get a place.

• A) Unless you will register early, you will not get a place.'Will' cannot follow 'unless' in the standard form.
• B) Unless you register early, you will not get a place.'Unless' is equivalent to 'if not' plus the base verb.
• C) Unless you register, you will not get a place early.The adverb 'early' must modify the registration, not the place.
• D) Unless you early register, you will not get a place.The adverb must precede the verb, not follow it.

Respuesta correcta: D) Would you like to live in the countryside?

• A) Would you like living in the countryside?After a modal-like auxiliary the verb must be in the base form.
• B) Do you would like to live in the countryside?'Do' cannot be stacked with 'would'.
• C) You would like to live in the countryside?Without an auxiliary the sentence is not a question.
• D) Would you like to live in the countryside?'Would' plus base verb after 'you' is the correct interrogative form.

Respuesta correcta: C) had

• A) will have'Will have' belongs to the future perfect, not to this conditional.
• B) haveThe present 'have' would make this the first conditional.
• C) had'Had' is the simple past of 'have' and fits the second conditional.
• D) would have'Would' cannot open the 'if' clause of the second conditional.

Respuesta correcta: A) If she would accept, we would go together.

• A) If she would accept, we would go together.'Would' cannot open the 'if' clause of the second conditional.
• B) If she accepted, we would go together.'Accepted' plus 'would' base is the correct second conditional.
• C) If she accepts, we will go together.That is the first conditional structure, which is also valid.
• D) If she had accepted, we would have gone together.That is the third conditional, which is also correct.

Respuesta correcta: C) The damage depends on whether the rainy season continues

• A) The crop has already been damagedThe condition is stated in the future, not as an accomplished fact.
• B) The rainy season has endedThe text presents the continuation of the season as a possibility.
• C) The damage depends on whether the rainy season continues'If' plus present plus 'will' links a condition to its likely result.
• D) The crop will survive the seasonThe text states the opposite consequence: damage.

Respuesta correcta: A) It introduces the condition for the result

• A) It introduces the condition for the result'If' states what has to happen first for the effect to occur.
• B) It introduces a time referenceTime reference requires 'when', 'while' or 'as soon as'.
• C) It introduces a contrastContrast requires 'although', 'even if' or 'while'.
• D) It introduces a reasonReason requires 'because' or 'since'.

Respuesta correcta: B) Water boils at 100 degrees; if you heat it today, it will boil

• A) Water will boil at 100 degrees; if you heat it today, it boilsThe tense assignment is reversed in both clauses.
• B) Water boils at 100 degrees; if you heat it today, it will boilZero conditional for the general truth, first conditional for the specific future case.
• C) Water boiled at 100 degrees; if you will heat it, it boilsThe simple past contradicts a general truth still valid.
• D) Water boils at 100 degrees; if you heat it today, it would boil'Would' introduces a hypothetical that the first conditional does not need.

Respuesta correcta: D) would

• A) will'Will' states a firm future plan, not a conditional consequence.
• B) am goingThe present continuous refers to an action in progress now.
• C) have goneThe present perfect refers to a past action.
• D) would'Would' plus base verb continues the hypothetical frame of the question.

Respuesta correcta: A) It describes an unreal situation in the past

• A) It describes an unreal situation in the pastThat is precisely what the past perfect and 'would have' express.
• B) It describes a probable future eventA probable future event belongs to the first conditional.
• C) It expresses a general truthA general truth belongs to the zero conditional.
• D) It expresses regret about the futureRegret about the past is expressed with 'wish' plus past perfect.