How are second conditionals formed?

This is how you make up second conditionals in English:

If-clause (condition)Main clause (result)
If + simple pastwould + infinitive
If I won the lottery,I would buy a BMW.
If it snowed next July,I would be very surprised.

It is also possible to form second conditionals with words such as could, should and might instead of would. Look at these examples:

If I won the lottery, I could afford a new car.
If no one was late, we could start the meeting.
Sarah might be able to help you if you asked her.
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