Form

Formula: If + past simple, would + infinitive
If clause (hypothetical condition)Main clause (imagined result)
If I had more money,I would buy a house.
If she spoke Spanish,she would get the job.
If he didn't work so hard,he would feel better.
If I were you,I wouldn't do that.
were not was: In formal/standard English, use were for all subjects in the if clause: "If I were rich…" / "If she were here…" In informal speech, "was" is also common: "If I was you…"
would → 'd: Short form: "I 'd buy" / "She 'd go" / "They wouldn't agree."

Use

The second conditional describes situations that are imaginary, unlikely or impossible in the present or future.

UseExample
Imaginary / hypothetical present If I lived in Paris, I would visit the Louvre every week.
(I don't live in Paris)
Unlikely future If it snowed in summer, everyone would be shocked.
(very unlikely)
Advice (If I were you…) If I were you, I would apologise.
Wishes and dreams If I could fly, I would visit every country.

First vs Second Conditional

First ConditionalSecond Conditional
Real / possible future situation Hypothetical / unlikely situation
If it rains, I will stay in.
(rain is possible today)
If it rained every day, I would move away.
(hypothetical, not likely)
If I find a good job, I 'll move.
(realistic future plan)
If I won the lottery, I 'd buy a yacht.
(dream, unlikely)

Exercises

Choose the correct form. First or second conditional?

1. If I ___ a million euros, I'd travel the world. (I don't have a million euros.)

2. If she studies tonight, she ___ the test. (It's realistic — she can study.)

3. If I ___ you, I would talk to him directly.

4. If dogs ___ (can) talk, what would yours say?