Conditionals Type 0 1

Respuesta correcta: C) If you heat ice, it melts.

• A) If you had heated ice, it would have melted.That is the third conditional, referring to an unreal past situation.
• B) If you heat ice, it would melt.That is the first conditional, describing a possible future situation.
• C) If you heat ice, it melts.'If' plus present plus present states a general truth.
• D) If you would heat ice, it melts.'Would' after 'if' belongs to a hypothetical conditional, not the zero.

Respuesta correcta: C) rains

• A) will rain'Will' belongs to the main clause, not to the 'if' clause of this conditional.
• B) is rainingThe present continuous suggests a currently temporary situation, not a future condition.
• C) rains'If it rains' plus 'we will cancel' is the standard first conditional.
• D) rainedThe simple past in the 'if' clause would indicate the third conditional.

Respuesta correcta: B) A possible situation and its likely result in the future

• A) An impossible situation in the pastAn unreal past situation is expressed by the third conditional.
• B) A possible situation and its likely result in the futureThat is the meaning of the first conditional.
• C) A general truth that is always validA general truth belongs to the zero conditional.
• D) A regret about the pastRegret is expressed with 'wish' plus the past perfect.

Respuesta correcta: B) If I had more time, I would learn another language.

• A) If I have more time, I would learn another language.That is the first conditional structure, not the second.
• B) If I had more time, I would learn another language.'If' plus past simple plus 'would' base is the second conditional.
• C) If I had more time, I will learn another language.'Will' does not belong to the second conditional's main clause.
• D) If I would have more time, I learn another language.'Would' cannot follow 'if' in this pattern.

Respuesta correcta: D) If she had studied harder, she would have passed the exam.

• A) If she studies harder, she would have passed the exam.That mixes the first conditional's 'if' clause with the third's main clause.
• B) If she had studied harder, she will have passed the exam.'Will have' does not belong to the third conditional.
• C) If she would have studied, she would have passed the exam.'Would have' cannot be used in the 'if' clause of the third conditional.
• D) If she had studied harder, she would have passed the exam.'Had studied' plus 'would have passed' is the third conditional.

Respuesta correcta: C) were

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

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

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

Respuesta correcta: D) 'If' plus 'will' is incorrect; it should be 'If it rains'

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

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 is mentioned; the statement is always true.
• 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: C) were

• A) am'Am' is the simple present of 'to be' with 'I'.
• B) will be'Will be' belongs to the first conditional's main clause.
• C) were'Were' is the form used for every person in the second conditional.
• D) had beenThe past perfect would place the condition before another past moment.

Respuesta correcta: D) 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) would have'Would' cannot open the 'if' clause of the second conditional.
• D) had'Had' is the simple past of 'have' and fits the second conditional.

Respuesta correcta: B) I wish I had booked the flight earlier.

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

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

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

Respuesta correcta: B) Water freezes at zero degrees, so ice forms on the surface.

• A) Water will freeze at zero degrees, so ice would form on the surface.That mixes the first and second conditionals without reason.
• B) Water freezes at zero degrees, so ice forms on the surface.'If' is not needed for this general truth, and the present simple is correct throughout.
• C) Water would freeze at zero degrees, so ice had formed on the surface.That mixes the second and third conditionals.
• D) Water froze at zero degrees, so ice had formed on the surface.That describes a single past event, not a general truth.

Respuesta correcta: A) I would visit the Galapagos Islands.

• A) I would visit the Galapagos Islands.'Would visit' keeps the hypothetical frame of the question.
• B) I visited the Galapagos Islands last year.That answers a question about the past, not about a hypothetical present chance.
• C) I will visit the Galapagos Islands next year.'Will' states a future plan rather than the hypothetical answer.
• D) I visit the Galapagos Islands every year.The simple present describes a habit, not a hypothetical situation.

Respuesta correcta: C) If he would be taller, he would play basketball.

• A) If he were taller, he would play basketball.'Were' plus 'would' base is the correct second conditional.
• B) If he is taller, he will play basketball.That is the first conditional structure, which is also valid.
• C) If he would be taller, he would play basketball.'Would' cannot open the 'if' clause of the second conditional.
• D) If he played taller, he would play basketball.'Played taller' is semantically wrong, but the tense frame is the second conditional.

Respuesta correcta: A) had left

• A) had left'Had left' is the past perfect required in the third conditional's 'if' clause.
• B) leftThe simple past in the 'if' clause would not express the unreal condition properly.
• 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: D) That the altitude matters, since boiling point changes with pressure

• A) That water always boils at the same temperature everywhereThe added condition shows that the temperature is not always the same.
• B) That heating is unnecessaryHeating is the condition of the statement, so it is necessary.
• C) That sea level is the only place with waterThe phrase refers to altitude, not to the existence of water.
• D) That the altitude matters, since boiling point changes with pressureThe added condition limits the general truth stated in the sentence.

Respuesta correcta: A) If you do not hurry

• A) If you do not hurry'Unless' is equivalent to 'if not' plus the base verb.
• B) If you hurryThat reverses the condition given in the sentence.
• C) When you hurry'When' introduces time, not a negative condition.
• D) Because you hurry'Because' introduces a cause, not a condition.

Respuesta correcta: D) If it rains, we will stay in; if we were in Quito, we would stay at home

• A) If it rains, we will stay in; if we were in Quito, we will stay at homeThe second clause uses 'will', which belongs to the first conditional.
• B) If it will rain, we stay in; if we were in Quito, we would stay at homeThe first clause incorrectly puts 'will' after 'if'.
• C) If it rained, we would stay in; if we were in Quito, we stay at homeThe second clause uses the simple present, breaking the hypothetical frame.
• D) If it rains, we will stay in; if we were in Quito, we would stay at homeFirst conditional for the real possibility, second for the hypothetical situation.