If+Past participle/would +Infinite
|!||With the verb "to be" we can say was/were
If I/he was rich, I/he would travel to Australia = If I/he were rich, I/he would travel to Australia
Compare the first and second conditional
|FIRST||Likely or possible situations|
If we have a free room we'll call you.
(Maybe we'll have a room. Then we'll call you)
|SECOND||Unlikely or impossible situations|
If I had money I'd book a room in the Ritz Hotel.
(I don't have any money, so I can't book a room in the Ritz)