Grammar › Conditionals › First vs Second Conditional
First vs Second Conditional
Both talk about a condition and its result. Choose by how likely the situation is:
- First conditional — real, likely future (If it rains, I'll stay home).
- Second conditional — imaginary or unlikely (If I won the lottery, I'd travel).
Likely to happen → first (present + will). Imaginary or unlikely → second (past + would).
The difference in one table
| First conditional | Second conditional | |
|---|---|---|
| Meaning | Real, likely future | Imaginary or unlikely |
| If-clause | present simple | past simple |
| Result | will + base verb | would + base verb |
| Example | If it rains, I’ll stay home. | If I won, I’d travel. |
The first conditional says this could really happen. The second says this is just imagination.
When to use each
First — you think it’s likely
- If I have time tonight, I’ll call you. (I probably will have time)
Second — imaginary or unlikely
- If I had a private jet, I’d fly everywhere. (I don’t have one)
- If I were you, I’d apologise. (advice, imagining being you)
⚠️ Same idea, different likelihood: If I win the lottery, I’ll buy a house (I bought a ticket) vs If I won the lottery, I’d buy a house (just dreaming).
Common mistakes
1. Mixing the two. If I had time, I’ll help → choose one: If I have time, I’ll help (real) or If I had time, I’d help (imaginary).
2. Using ‘will’ or ‘would’ in the if-clause. If it will rain / If I would win → If it rains / If I won.
3. ‘Was’ instead of ‘were’ in the second. If I was you → If I were you. Pro tip: ask yourself “could this really happen?” Yes → first; no → second.
✏️ Practice: First vs Second Conditional
1. It's very likely: If I ___ time tonight, I'll call you.
2. It's just a dream: If I ___ a castle, I'd invite everyone.
3. If it rains tomorrow, we ___ the match.
4. If I ___ you, I'd take the job.
5. Which is a real, likely plan?
6. If she studies hard, she ___ the exam.
7. Correct this: 'If I had time now, I'll help you.'
8. If you ___ me tomorrow, I'll send the file.
9. It's very unlikely: If I ___ the president, I would change the law.
10. Rewrite as imaginary: 'If I have money, I'll travel.' →
Frequently asked questions
What is the main difference between the first and second conditional?
The first is for real, likely futures (If I have time, I'll help). The second is for imaginary or unlikely situations (If I had time, I'd help).
Does the second conditional talk about the past?
No. It uses a past-tense form, but it refers to an imaginary present or future, not to past time.
Can the same situation take either?
Yes, depending on how likely you think it is. 'If I win, I'll celebrate' (you might win) vs 'If I won, I'd celebrate' (you don't expect to).
👩🏫 For teachers
CEFR objectives for “First vs Second Conditional”:
- Can choose between the first and second conditional based on likelihood (CEFR B1).
- Can form both: if + present + will, and if + past + would.
- Can explain that the second conditional's past form signals 'imaginary', not past time.
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