Conditionals Type 0 1

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

• A) If you heat ice, it melts.Correct. The zero conditional expresses a general truth and uses the present in both parts of the sentence.
• B) If you heated ice, it would melt.Incorrect. That sentence is a second conditional, which talks about a hypothetical situation rather than a general truth.
• C) If you will heat ice, it melts.Incorrect. The zero conditional does not take 'will' in the 'if' clause; the present simple 'heat' is enough.
• D) If you heat ice, it would melted.Incorrect. In the zero conditional the second part also takes the present simple, not a conditional form.

Respuesta correcta: C) rains

• A) will rainIncorrect. The 'if' clause does not take 'will' in the first conditional; the correct form is 'rains'.
• B) rainedIncorrect. 'Rained' is past simple and belongs to the third conditional, not to a future condition.
• C) rainsCorrect. The first conditional uses the present simple in the 'if' clause and the future with 'will' in the main clause.
• D) is rainingIncorrect. The present continuous is not used in the 'if' clause of the first conditional.

Respuesta correcta: B) turns

• A) will turnIncorrect. 'Will turn' belongs to the first conditional, which needs a possible future condition rather than a general fact.
• B) turnsCorrect. It is a general, verifiable fact, so both parts take the present simple, as the zero conditional requires.
• C) would turnIncorrect. 'Would' belongs to the second and third conditionals, not to the zero conditional.
• D) turnedIncorrect. 'Turned' is past simple and describes a hypothetical situation, which the zero conditional does not express.

Respuesta correcta: D) will miss

• A) missIncorrect. With a negative condition and a future result, the main clause needs 'will' plus the infinitive.
• B) would missIncorrect. 'Would' expresses a second conditional hypothesis, not a likely future result.
• C) missedIncorrect. 'Missed' is past simple and does not match the future consequence the sentence expresses.
• D) will missCorrect. 'Unless' means 'if not', so the sentence works as a first conditional with the future in the main clause.

Respuesta correcta: D) have

• A) am havingIncorrect. The present continuous does not appear in the 'if' clause of a first conditional.
• B) will haveIncorrect. The conditional clause does not take 'will' when it expresses a present condition with a future consequence.
• C) would haveIncorrect. 'Would have' belongs to the third conditional, which refers to a past situation that is already over.
• D) haveCorrect. In the first person, the first conditional allows 'if' with either the present or the past simple, and both forms are correct.

Respuesta correcta: B) When you switch the light on, the room lights up.

• A) When you will switch the light on, the room lights up.Incorrect. The 'when' clause does not take 'will' when it describes a habitual, general relationship.
• B) When you switch the light on, the room lights up.Correct. 'When' introduces a general fact and both parts take the present simple, as in the zero conditional.
• C) When you switched the light on, the room would light up.Incorrect. That structure belongs to the second conditional and does not describe a general fact.
• D) When you switch the light on, the room lit up.Incorrect. The past simple 'lit up' breaks the consistent present tense the zero conditional requires.

Respuesta correcta: A) will pass

• A) will passCorrect. With the clauses reversed, the main clause takes 'will' plus the infinitive and the 'if' clause stays in the present simple.
• B) passIncorrect. Because the sentence expresses a future consequence, the main clause needs 'will' to mark it explicitly.
• C) would passIncorrect. 'Would' expresses a second conditional hypothesis, not a likely future consequence.
• D) passedIncorrect. 'Passed' is past simple and fits neither a present condition nor a future result.

Respuesta correcta: C) If you mix blue and yellow, you get green.

• A) If you mixed blue and yellow, you would get green.Incorrect. That sentence is a second conditional and presents the fact as hypothetical rather than general.
• B) If you will mix blue and yellow, you get green.Incorrect. The 'if' clause does not take 'will' in either the zero or the first conditional.
• C) If you mix blue and yellow, you get green.Correct. Both parts take the present simple and describe a constant relationship, which is what the zero conditional is for.
• D) If you mix blue and yellow, you would get green.Incorrect. Mixing the present in the condition with a conditional form in the main clause does not match any standard type.

Respuesta correcta: C) should

• A) should toIncorrect. The modal 'should' is not followed by 'to', because the main verb comes directly after it in the base form.
• B) must toIncorrect. 'Must' does not allow 'to' after it, and an obligation would also be too strong for a recommendation.
• C) shouldCorrect. 'If you want to, you should' is a very common structure in spoken English and works as an advice condition.
• D) mustIncorrect. 'Must' expresses a stronger obligation than the recommendation the sentence asks for, so it does not match the sentence's intent.

Respuesta correcta: A) What will you do if you win the scholarship?

• A) What will you do if you win the scholarship?Correct. In a first conditional question the future clause opens the sentence and the 'if' clause stays in the present simple.
• B) What you will do if you will win the scholarship?Incorrect. Question word order requires 'what' to open the sentence, and the 'if' clause must not take 'will'.
• C) What will you do if you won the scholarship?Incorrect. 'Won' is past simple and expresses a second conditional hypothesis, not a future condition.
• D) What do you will do if you win the scholarship?Incorrect. The auxiliary 'do' cannot be combined with 'will', because both do the same grammatical job.

Respuesta correcta: D) won't understand

• A) don't understandIncorrect. The negative present simple does not mark the future consequence the sentence introduces.
• B) will not understandsIncorrect. After 'will not' the verb takes the base form 'understand', not the third person form, because modal verbs leave the main verb in its base form.
• C) would not understandIncorrect. 'Would' belongs to the second conditional and makes the consequence hypothetical.
• D) won't understandCorrect. The negative 'will not' contracts to 'won't', and 'unless' introduces the negative condition, equivalent to 'si no' (if not).

Respuesta correcta: B) If you touch that plant, you will get an allergic reaction.

• A) If you touched that plant, you would get an allergic reaction.Incorrect. 'Would' turns it into a second conditional, which sounds less direct as a warning.
• B) If you touch that plant, you will get an allergic reaction.Correct. The first conditional expresses a likely consequence that works as a warning.
• C) If you touching that plant, you will get an allergic reaction.Incorrect. The present continuous does not fit in the 'if' clause of the first conditional.
• D) If you will touch that plant, you get an allergic reaction.Incorrect. 'Will' does not go in the 'if' clause, and the present simple in the main clause does not mark a future consequence either.

Respuesta correcta: B) has

• A) haveIncorrect. 'Have' goes with I, you, we and they, but the subject 'she' is third person singular.
• B) hasCorrect. 'Has' is the third person present simple form, so it is correct in the 'if' clause.
• C) will haveIncorrect. The 'if' clause does not take 'will' in the first conditional, and the future form is unnecessary there.
• D) havingIncorrect. In this unit, the gerund does not replace the main verb in the conditional clause.

Respuesta correcta: D) If I drinks coffee at night, I don't sleep well.

• A) If you drink coffee at night, you don't sleep well.Not the answer here: 'drink' agrees with 'you', and both halves in the present simple form a correct zero conditional.
• B) If he drinks coffee at night, he doesn't sleep well.Not the answer here: 'drinks' is the correct third person singular form for the subject 'he'.
• C) If they drink coffee at night, they don't sleep well.Not the answer here: 'drink' agrees with the plural subject 'they', and the sentence is perfectly grammatical.
• D) If I drinks coffee at night, I don't sleep well.This is the answer: it is the incorrect sentence, because 'I' requires the base form 'drink' and not 'drinks' in the present simple.

Respuesta correcta: C) if

• A) thatIncorrect. In this unit, 'That' does not introduce a condition; the correct connector for a conditional clause is 'if'.
• B) whenIncorrect. 'When' would mark a time relationship that is already complete, not a future condition.
• C) ifCorrect. 'If' introduces the conditional clause and the future 'will you' opens the main clause.
• D) whatIncorrect. 'What' introduces an indirect question and does not link the two clauses of a conditional.

Respuesta correcta: A) If you push that button, the machine stops.

• A) If you push that button, the machine stops.Correct. Both parts in the present simple describe a constant result, which is the typical use of the zero conditional.
• B) If you pushed that button, the machine would stop.Incorrect. That sentence is a second conditional and presents the result as hypothetical.
• C) If you will push that button, the machine stops.Incorrect. The zero conditional never allows 'will' in the 'if' clause.
• D) If you push that button, the machine would stop.Incorrect. The zero conditional keeps the present simple in both parts and never uses 'would'.

Respuesta correcta: A) Yes, I will.

• A) Yes, I will.Correct. A short answer to a first conditional question uses 'will', like the question, without repeating the condition.
• B) Yes, I would.Incorrect. A short answer to a first conditional question repeats 'will', and 'would' belongs to another type of conditional.
• C) Yes, I do.Incorrect. 'Do' answers a present simple question, not one built with 'will'.
• D) Yes, I am.Incorrect. 'Am' is a form of the verb 'to be' and does not fit a question with the future in the main clause.

Respuesta correcta: D) If you don't leave now, you will miss the concert.

• A) If you will not leave now, you will miss the concert.Incorrect. The 'if' clause does not take 'will not'; the future belongs in the main clause.
• B) If you didn't leave now, you will miss the concert.Incorrect. 'Didn't' is past simple and belongs to the third conditional, not to a present condition.
• C) If you not leave now, you will miss the concert.Incorrect. The auxiliary 'do' is missing, and it is what forms the present simple negative.
• D) If you don't leave now, you will miss the concert.Correct. The condition is in the negative present simple and the consequence is in the future, which is the first conditional structure.

Respuesta correcta: B) If she studies hard, she will probably pass the test.

• A) If she studies hard, she would probably pass the test.Incorrect. 'Would probably' belongs to the second conditional and places the action in a hypothetical world.
• B) If she studies hard, she will probably pass the test.Correct. 'Will probably' signals a likely consequence and keeps the first conditional structure.
• C) If she will study hard, she probably passes the test.Incorrect. The 'if' clause does not take 'will', and the present simple in the main clause does not mark a future consequence.
• D) If she studied hard, she probably passed the test.Incorrect. With both parts in the past simple, the sentence describes a past situation, not a likely future consequence.

Respuesta correcta: C) drink

• A) drinksIncorrect. 'Drinks' is third person singular, but the subject of the sentence is 'I'.
• B) will drinkIncorrect. 'Every time' describes repetition and belongs to the zero conditional, so the clause takes no future.
• C) drinkCorrect. 'Every time' introduces a zero conditional, and 'drink' agrees with the first person subject 'I'.
• D) drankIncorrect. 'Drank' is an irregular past simple and describes a single occasion, not a habitual repetition.