Conditional Sentences

English Grammar Tutorial

Lesson 18 of 18

1. What Are Conditional Sentences?

A conditional sentence describes a condition and its result. It often uses the word if.

Hindi meaning: Conditional sentences में किसी शर्त और उसके परिणाम के बारे में बताया जाता है। “If” का अर्थ अक्सर “अगर” या “यदि” होता है।
Structure: If + condition, result.
Example: If it rains, we will stay at home.
Hindi: अगर बारिश होती है, तो हम घर पर रहेंगे।

You can usually put the if-clause first or second:

  • If you study hard, you will pass the exam.
  • You will pass the exam if you study hard.

Note: When the if-clause comes first, we normally use a comma between the two clauses.

2. Zero Conditional — Facts and General Truths

Use the zero conditional for facts, rules, habits, and results that are generally true.

Structure: If + present simple, present simple
English sentenceHindi meaning
If you heat ice, it melts.अगर आप बर्फ को गर्म करते हैं, तो वह पिघलती है।
If water reaches 100°C at standard atmospheric pressure, it boils.सामान्य वायुदाब पर पानी 100°C तक पहुँचता है, तो वह उबलता है।
If I drink coffee at night, I have trouble sleeping.अगर मैं रात में कॉफी पीता हूँ, तो मुझे सोने में परेशानी होती है।
If students practise regularly, they improve.अगर विद्यार्थी नियमित अभ्यास करते हैं, तो वे बेहतर होते हैं।

3. First Conditional — Real Future Possibilities

Use the first conditional for a possible future condition and its likely result.

Structure: If + present simple, will + base verb
English sentenceHindi meaning
If it rains, we will stay at home.अगर बारिश हुई, तो हम घर पर रहेंगे।
If you study hard, you will pass.अगर तुम मेहनत से पढ़ोगे, तो पास हो जाओगे।
If she comes early, we will start the meeting.अगर वह जल्दी आएगी, तो हम मीटिंग शुरू करेंगे।
If I have enough money, I will buy a laptop.अगर मेरे पास पर्याप्त पैसे होंगे, तो मैं लैपटॉप खरीदूँगा।
If you call me, I will help you.अगर तुम मुझे फोन करोगे, तो मैं तुम्हारी मदद करूँगा।
Important: In a normal future conditional, use the present simple after if, not will.
Correct: If he comes, I will talk to him.
Incorrect: If he will come, I will talk to him.

4. Second Conditional — Imaginary or Unlikely Situations

Use the second conditional for unreal, imaginary, or unlikely situations in the present or future.

Structure: If + past simple, would + base verb
English sentenceHindi meaning
If I had a car, I would drive to work.अगर मेरे पास कार होती, तो मैं गाड़ी चलाकर काम पर जाता।
If I were rich, I would help poor people.अगर मैं अमीर होता, तो गरीब लोगों की मदद करता।
If she knew the answer, she would tell us.अगर उसे जवाब पता होता, तो वह हमें बताती।
If we lived near the school, we would walk there.अगर हम स्कूल के पास रहते, तो वहाँ पैदल जाते।
If I could speak French, I would work in France.अगर मैं फ्रेंच बोल सकता, तो फ्रांस में काम करता।

Note: In formal or careful English, “If I were you” is commonly used to give advice: If I were you, I would practise every day.

5. Third Conditional — Imaginary Past Situations

Use the third conditional to imagine a different past and its result. The situation did not happen as described.

Structure: If + past perfect, would have + past participle (V3)
English sentenceHindi meaning
If I had studied, I would have passed the exam.अगर मैंने पढ़ाई की होती, तो मैं परीक्षा पास कर गया होता।
If she had left earlier, she would have caught the train.अगर वह पहले निकली होती, तो ट्रेन पकड़ ली होती।
If they had invited me, I would have attended the party.अगर उन्होंने मुझे बुलाया होता, तो मैं पार्टी में गया होता।
If we had known about the traffic, we would have taken another road.अगर हमें ट्रैफिक के बारे में पता होता, तो हम दूसरा रास्ता लेते।

6. Mixed Conditional — Past Condition, Present Result

A mixed conditional connects a past condition with a present result.

Common structure: If + past perfect, would + base verb
  • If I had gone to bed earlier, I wouldn't be so tired now.
  • If he had studied medicine, he would be a doctor now.
  • If we had booked tickets, we would be at the concert now.

These sentences imagine a different past and explain how the present would be different.

7. Unless, As Long As, and Provided That

ExpressionMeaningExample
unlessif not / अगर नहींYou won't pass unless you study.
as long asonly if / बशर्ते किYou can use my laptop as long as you handle it carefully.
provided thaton the condition that / इस शर्त पर किYou can join the trip provided that your parents agree.
Avoid adding another negative after unless when you mean “if not.”
Correct: Unless you hurry, you will miss the bus.

8. Common Mistakes

IncorrectCorrectRule
If it will rain, we will stay home.If it rains, we will stay home.First conditional: present simple after if
If I will be rich, I would travel.If I were rich, I would travel.Second conditional: past form
If I had studied, I will pass.If I had studied, I would have passed.Third conditional: would have + V3
Unless you don't hurry, you will be late.Unless you hurry, you will be late.Unless already means “if not”

9. Quick Summary

TypeStructureUse
ZeroIf + present, presentFacts and general truths
FirstIf + present, will + V1Real future possibility
SecondIf + past, would + V1Imaginary or unlikely present/future
ThirdIf + past perfect, would have + V3Imaginary past
MixedIf + past perfect, would + V1Past condition with present result

10. Quick Quiz

Choose the correct answer for each question.

1. If you heat ice, it _____.

2. If I study hard, I _____ the exam.

3. If I had known, I _____ you.