C1 Advanced Conditionals 4 min read

Conditional: 'Supposing' (What if)

Use 'supposing' to elevate hypothetical questions from simple logic to creative, engaging 'what if' scenarios.

The Rule in 30 Seconds

  • Use 'supposing' to introduce hypothetical or imaginary situations instead of 'if'.
  • Follow with Past Simple for present/future or Past Perfect for the past.
  • It often starts a sentence to set a creative or investigative tone.
  • Commonly used in brainstorming, negotiations, and deep 'what if' style conversations.

Quick Reference

Time Frame Verb in 'Supposing' Clause Main Clause Structure
Present/Future Past Simple Subject + would/could/might + verb
Past Past Perfect Subject + would have + past participle
Real Possibility Present Simple Subject + will/can/may + verb
Polite Suggestion Past Simple Question form (e.g., What would...?)
Formal Hypothesis Were to + verb Subject + would + verb
Negative Scenario Negative Past Simple Resulting consequence

Key Examples

3 of 9
1

Supposing you won the lottery, would you quit your job?

Suponiendo que ganaras la lotería, ¿dejarías tu trabajo?

2

Supposing they had missed the flight, they would have been stranded.

Suponiendo que hubieran perdido el vuelo, se habrían quedado varados.

3

Supposing the weather stays clear, we can hike to the summit.

Suponiendo que el tiempo se mantenga despejado, podemos subir a la cima.

💡

The 'That' Option

Add 'that' after 'supposing' to sound more professional in written reports or formal speeches.

⚠️

No 'Will' Allowed

Avoid using 'will' immediately after 'supposing'. It’s like putting orange juice on cereal—it just doesn't fit!

The Rule in 30 Seconds

  • Use 'supposing' to introduce hypothetical or imaginary situations instead of 'if'.
  • Follow with Past Simple for present/future or Past Perfect for the past.
  • It often starts a sentence to set a creative or investigative tone.
  • Commonly used in brainstorming, negotiations, and deep 'what if' style conversations.

Overview

Imagine you are a dreamer. You do not just state facts. You build worlds. Supposing is your tool for this. It is more than just a simple if. It invites the listener to join your fantasy. Think of it as a spark for imagination. It is perfect for advanced speakers. It adds flavor to your English. It makes your hypothetical scenarios feel more vivid. You are not just talking about logic. You are talking about possibilities. It is like opening a door to a 'what if' room. Let's step inside and see how it works.

How This Grammar Works

This structure works by setting a specific condition. But it is not a normal, everyday condition. It is a hypothetical leap. It usually sits at the very start of your sentence. This gives it a lot of power. It tells the listener: 'Get ready to use your imagination.' It often pairs with a question in the second half. This makes it very interactive. You are not just talking at people. You are asking them to think with you. It functions as a conjunction. It replaces if to make the scenario feel more experimental. Yes, even native speakers mess this up sometimes! But once you master it, you sound much more sophisticated.

Formation Pattern

  1. 1Start your sentence with the word supposing.
  2. 2You can add the word that for extra formality.
  3. 3Most people leave that out in daily conversation.
  4. 4Add your subject next (I, you, we, the cat).
  5. 5Use the Past Simple for present or future scenarios.
  6. 6This is called 'backshifting' and shows it is not real.
  7. 7Use the Past Perfect (had + verb) for past scenarios.
  8. 8Place a comma after the first clause.
  9. 9Finish the thought with a result or a question.
  10. 10Use modals like would, could, or might in the second part.

When To Use It

Use it when you are brainstorming at work. It is perfect for business meetings. 'Supposing we changed the logo?' It sounds less aggressive than a direct suggestion. Use it when you are playing 'devil's advocate'. This means you are testing an idea's strength. 'Supposing the plan fails. What then?' It helps you prepare for the worst. Use it for romantic or deep conversations. 'Supposing we never met. Where would you be?' It adds a touch of drama and emotion. Think of it like a grammar traffic light. It tells your brain to slow down and consider the 'maybe'.

When Not To Use It

Don't use it for scientific facts or certainties. Supposing water boils at 100 degrees sounds very silly. We know it does. It is a fact, not a dream. Also, avoid it in extremely short, urgent commands. Supposing you run! is confusing. Just say Run! or If you don't run, you'll be late. It is also too 'flavorful' for a toaster manual. Keep it for situations where there is room for doubt. If something is 100% likely, stick to when or if.

Common Mistakes

The biggest mistake is using will or would in the first clause. Supposing it will rain is incorrect. Always use the past form: Supposing it rained. Another mistake is forgetting the comma. The comma separates the 'if' part from the 'then' part. Don't use it for things that are definitely true. Supposing I am a human is just weird. We know you are a human. Unless you are a very clever robot! In that case, welcome to Earth. Finally, make sure your tenses match. Don't mix a past condition with a present result unless you mean to.

Contrast With Similar Patterns

Let's look at if. If is your reliable old car. It gets you from A to B. It is neutral and safe. Supposing is a hot air balloon. It takes you higher into the world of 'maybe'. Imagine is a bit more forceful. It is a direct command to the brain. What if is the quick, casual cousin. You hear it in the pub or at the gym. Supposing is the elegant middle ground. It works in both casual and semi-formal settings. It feels more like a complete thought than a quick 'what if'.

Quick FAQ

Q. Is it more formal than if?

A. Yes, it usually feels a bit more structured and thoughtful.

Q. Can I use it for the past?

A. Absolutely, just use the past perfect tense.

Q. Do I always need a question mark?

A. No, only if the second part of the sentence is a question.

Q. Can I use suppose instead?

A. Yes, suppose and supposing are often interchangeable as conjunctions.

Q. Is it common in exams?

A. Yes, C1 examiners love to see this advanced conditional structure.

Reference Table

Time Frame Verb in 'Supposing' Clause Main Clause Structure
Present/Future Past Simple Subject + would/could/might + verb
Past Past Perfect Subject + would have + past participle
Real Possibility Present Simple Subject + will/can/may + verb
Polite Suggestion Past Simple Question form (e.g., What would...?)
Formal Hypothesis Were to + verb Subject + would + verb
Negative Scenario Negative Past Simple Resulting consequence
💡

The 'That' Option

Add 'that' after 'supposing' to sound more professional in written reports or formal speeches.

⚠️

No 'Will' Allowed

Avoid using 'will' immediately after 'supposing'. It’s like putting orange juice on cereal—it just doesn't fit!

🎯

Questioning Power

Start a sentence with 'Supposing...' to gently challenge someone's opinion without being rude.

💬

British vs American

You'll hear 'supposing' slightly more often in British English, but it's understood and used globally.

Beispiele

9
#1 Basic Present

Supposing you won the lottery, would you quit your job?

Focus: won

Suponiendo que ganaras la lotería, ¿dejarías tu trabajo?

Uses past simple 'won' for a hypothetical present.

#2 Basic Past

Supposing they had missed the flight, they would have been stranded.

Focus: had missed

Suponiendo que hubieran perdido el vuelo, se habrían quedado varados.

Uses past perfect for a past hypothesis.

#3 Edge Case (Real)

Supposing the weather stays clear, we can hike to the summit.

Focus: stays

Suponiendo que el tiempo se mantenga despejado, podemos subir a la cima.

Present simple used for a realistic possibility.

#4 Edge Case (Formal)

Supposing that the contract were to be signed, we would begin immediately.

Focus: were to be

Suponiendo que el contrato se firmara, empezaríamos de inmediato.

Uses 'were to' for extra formality.

#5 Formal Context

Supposing that the board rejects the proposal, what is our next step?

Focus: rejects

Suponiendo que la junta rechace la propuesta, ¿cuál es nuestro siguiente paso?

Includes 'that' for a more professional tone.

#6 Informal Context

Supposing we just left right now? No one would notice.

Focus: left

¿Y si nos fuéramos ahora mismo? Nadie se daría cuenta.

Very conversational, dropping the main clause structure.

#7 Mistake Corrected

✗ Supposing I will see him, I'll tell him. → ✓ Supposing I saw him, I'd tell him.

Focus: saw

Si lo viera, se lo diría.

Don't use 'will' in the supposing clause.

#8 Mistake Corrected

✗ Supposing he has known, he would have helped. → ✓ Supposing he had known, he would have helped.

Focus: had known

Si él lo hubiera sabido, habría ayudado.

Must use past perfect for past results.

#9 Advanced Mixed

Supposing you had taken that job, would you be happy now?

Focus: had taken

Suponiendo que hubieras aceptado ese trabajo, ¿serías feliz ahora?

Mixed conditional: past condition, present result.

Test Yourself

Complete the hypothetical present scenario with the correct verb form.

Supposing you ___ (have) the chance to travel anywhere, where would you go?

✓ Correct! ✗ Not quite. Richtige Antwort: had

We use the past simple 'had' to show the situation is hypothetical, not real.

Choose the correct past perfect form for this past hypothesis.

Supposing we ___ (not/find) the keys, we would have been locked out all night.

✓ Correct! ✗ Not quite. Richtige Antwort: hadn't found

For past events that didn't happen, we use the past perfect 'hadn't found'.

Select the best modal for the result clause.

Supposing the internet crashed tomorrow, how ___ we communicate?

✓ Correct! ✗ Not quite. Richtige Antwort: would

The result of a hypothetical 'supposing' clause usually requires 'would'.

🎉 Score: /3

Visual Learning Aids

Supposing vs. If

If
Neutral If it rains, I'll stay home.
Common Standard for all conditions.
Supposing
Imaginative Supposing it rained gold?
Suggestive Invites the listener to dream.

Choosing Your Tense

1

Is the scenario in the past?

YES ↓
NO
Use Past Simple (e.g., Supposing I went...)
2

Did it actually happen?

YES ↓
NO
Use Past Perfect (e.g., Supposing I had gone...)

Contexts for Usage

💼

Business

  • Brainstorming
  • Strategy

Social

  • Deep talk
  • Joking

Frequently Asked Questions

21 questions

It means 'imagine if' or 'what if'. It sets up a hypothetical scenario for discussion.

Mostly, yes, but it is more descriptive. It emphasizes the act of imagining the situation.

No, it almost always starts the clause. You would say Supposing it rains... not It rains supposing....

Not at all! It's great for deep 'what if' conversations at a cafe. For example, Supposing you won a trip to Mars?.

Both work as conjunctions. Suppose you fell and Supposing you fell are both correct and common.

Use the past simple. Supposing we moved next year describes a future possibility.

Yes, if the situation is a real possibility. Supposing he arrives early, let him in.

Use the past perfect. Supposing you hadn't met her, would you be here?

Neither is 'more' correct. Supposing that is just slightly more formal.

Yes, could adds a sense of ability. Supposing you had wings, you could fly.

Just use the negative past. Supposing it didn't work, what would we do?

Yes, recruiters use it to test your logic. Supposing a client complained, how would you handle it?

You can use it to ask about options. Supposing you're out of fish, what's the next best thing?

'Imagine' is a verb/command, while 'supposing' is a conjunction. They are very similar in meaning.

Yes, 'what if' is the most common casual version. 'Supposing' is the more 'C1 level' choice.

No, it is a participle used as a conjunction here. It doesn't function as a noun.

Yes, for very unlikely things. Supposing the sun were to stop shining...

Yes, it shows you are less certain. Supposing we asked, they might say yes.

It is better for essays or discussions than for hard scientific data.

It's called the 'distancing effect'. It shows the idea is far from reality.

It is often called a 'functional conditional'. It does the same job as an 'if-clause'.

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