Second Conditional

When we are thinking about a situation in the present or future that is hypothetical, unlikely or impossible, we use

If + Past Simple, ...Would + Verb

We use a past verb though are imagining the present or the future to be different

The second clause of subject + would + verb (conditional verb) is conditional to the first clause happening (or will only happen if the first part/clause happens)

Example: If I won the lottery, I would travel around the world

= It is unlikely that I will win the lottery, but I'm going to hypothetically imagine that I did win. In that situation I would travel around the world. So in order for me to travel around the world, I would need the first clause (the condition or situation) to happen, that is, for me to win the lottery first

• If I won the lottery, I would travel around the world. (Though I am unlikely to win the lottery
• If I knew his name, I would tell you
• If I didn't have a headache, I would go to the party
• If I became President, I would reduce the salaries of all politicians. (Though it is unlikely I will become President

Notice how we use a comma after the past tense clause

We can also reverse the order and use

Conditional verb (would + verb) + If + Past Simple

• I would be happy if I had more free time
• I would tell you the answer if I knew what it was
• There would be fewer accidents if everyone drove more carefully
• We would have a lot of money if we sold our house
• Would she come if I paid for her flight
• Would you accept the job if they offered it to you
• What would you do if you won the lottery
• What would you do if you saw a U.F.O

Notice how the comma is not necessary with this word order

............If I were

Note that with the verb To Be we use IF + I / HE / SHE / IT + WERE

The reason we use WERE instead of WAS is because the sentence is in the Subjunctive mood

• If I were not in debt, I would quit my job
• If he were taller, he'd be accepted into the team
• She would be still be correcting my grammar if she were still alive

Though in informal English, you will hear some people say If I was... If he was... etc. This usage doesn't sound good though unfortunately is common

Could in Second Conditional sentences

COULD can be used instead of WOULD to make the hypothetical present or future more likely

• If he trained every day, he could represent his country
• If I had a little more money, I could buy a car