Levels & career tracks
Curso básico · A1–A2
Nivel A1.1 — IdentidadNivel A1.2 — Rutinas y entornoNivel A2.1 — Contando el mundoNivel A2.2 — Comparando y proyectandoIntermedio · B1–B2
Level B1.1 — Connecting experiences Current levelLevel B1.2 — Narrating and describingLevel B2.1 — ArguingLevel B2.2 — NuanceProfesional / Avanzado · C1–C2
Level C1.1 — PrecisionLevel C1.2 — Register and discourseLevel C2.1 — StyleLevel C2.2 — Native masteryInglés técnico y especialización
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The zero conditional talks about things that are always true — scientific facts, general truths, and fixed rules. Both parts use the present simple: "If you heat water, it boils." Unlike the First Conditional, this isn't about a possible future — it's about something that's true every single time.
Why this matters This lesson connects directly to your progress: it covers form: if + present simple, present simple; instructions and rules; telling zero and first conditional apart. Mastering this content lets you move forward confidently, and reinforces patterns you'll use again later. Take time to review every example before moving to the assessment — repetition is what actually locks knowledge in long-term.
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The goals of this lesson.
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You already know how to talk about specific future possibilities. This lesson covers something different: rules and facts that are always true, no matter when — the Zero Conditional ("If you heat water, it boils").
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Both the "if" clause and the result clause use the present simple. This structure describes something that is always true — not a possibility, a certainty.
| Part | Tense | Example |
|---|---|---|
| If clause | present simple | If you heat water, |
| Result clause | present simple | it boils. |
Examples
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The Zero Conditional is also common for fixed rules, instructions, and things that always happen the same way in a system or a routine.
Examples
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These two are easy to confuse because they look similar. The difference is simple: Zero Conditional describes something always true; First Conditional describes one possible, specific future situation.
Examples
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Read the text and answer the questions. You can try as many times as you want.
Mr. Davis is explaining the lab safety rules to his new students. "If you don't wear your safety glasses, you can't use the equipment," he says. "And remember: if you heat this chemical too fast, it reacts violently, so always go slowly."
He also reminds them of a basic fact: if metal gets hot enough, it changes color, so they can use color to estimate temperature safely. "If the alarm rings, everyone leaves immediately — no exceptions," he adds. "These rules exist because they're true every time, not just sometimes."
1. What happens if you don't wear safety glasses?
2. What happens if you heat the chemical too fast?
3. What can students use to estimate temperature?
4. What happens if the alarm rings?
5. Why do these rules exist, according to Mr. Davis?
💪 You can now describe facts and rules that are always true — and tell them apart from a specific future possibility. Keep going with B1!
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Usa las pistas para completar cada palabra en inglés. Sin calificar — repite las veces que quieras.
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The essentials of this lesson, summarized.
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Key terms to remember.
reaches the temperature at which liquid turns to gas
hiervebecomes solid because of low temperature
se congelalacking enough water in the body
deshidratado/abecomes larger in size
se expandeoverly excited or energetic
hiperactivo/amakes a clear ongoing sound, like a bell
suena (timbre, alarma)10
Tap the words in the correct order to form the sentence. Ungraded — repeat as many times as you like.
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Tap the correct verb form to complete each sentence. The other options are conjugations from other tenses — on purpose, so you learn to tell them apart.
If you water it boils
If the temperature drops below zero, water
If you this button, the machine turns on
If the alarm , everyone leaves the building
Plants if they don't get sunlight
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Listen to the full dialogue with the speaker buttons first, then fill in the missing words from this lesson's real conversation. Ungraded — repeat as many times as you like.
If you water to 100 degrees, it always .
If you don't have a , you can't .
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You need at least 80% to unlock the next lesson. You can retake it as many times as you want — your best score is saved.
1. "If you heat water to 100°C, it boils." — which one is correct?
2. What does this mean: "If you press this button, the machine turns on."?
3. Select the correct match for: "If you heat ice, it melts."
4. What does this mean: "If it rains tomorrow, I will stay home."?
5. "If you don't have a ticket, you can't enter." — which one is correct?
6. What does this mean: "If you don't drink water, you get dehydrated."?
7. Select the correct match for: "If the alarm rings, everyone leaves the building."
8. What does this mean: "If she eats that whole cake, she'll feel sick."?
9. "Metal expands if you heat it." — which one is correct?
10. What does this mean: "If you don't pay the bill, the service stops."?
Review — Lesson 35 What matches: "I used to play soccer every weekend."?
Review — Lesson 34 What matches: "I was working when she called."?
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You now describe facts and rules that are always true with the Zero Conditional. Next lesson: the First Conditional, for real future possibilities.
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Practice this lesson's vocabulary with a word search and flashcards. Ungraded — play as many times as you like.
Tap the first and last letter of a hidden word to find it. Los términos de varias palabras van sin espacios en el tablero (ej. "give up" aparece como GIVEUP).
Elige la respuesta correcta. Si aciertas, la tarjeta queda lista por hoy; si fallas, vuelve a aparecer pronto para reforzarla. Tu progreso se guarda en este dispositivo.