Conditional structures

    1st conditional: If + Present tense, ... will/won't ... - We use the first conditional to talk about things that we think might happen in the future. - E.g.: If I find your watch, I will tell you. (You've lost your watch, and I'll look for it - perhaps I'll find it) 2nd conditional: If + Past tense, ... would/wouldn't ... - We use the second conditional to imagine unreal things in the present: a) We use it to imagine things that we don't expect to happen e.g.: If I found a watch in the street, I'd (= I would) take it to the police. (No-one has really lost a watch - I'm just imagining the situation) b) We use it to imagine things that can't be true e.g.: If I lived in Hawaii, I'd go swimming every morning. (I don't live in Hawaii - I'm just imagining it) - In second conditionals, we can use were instead of was. This is used in a more formal style, and also in the phrase If I were you: e.g.: If I were you, I'd see a doctor. 3rd conditional: If + past perfect tense, ... would/wouldn't have (done) - We use the third conditional to imagine unreal things in the past - E.g.: If I'd known (=had known) you were alone, I would have visited you. (Unfortunately I didn't know, so I didn't visit you.) - E.g.: I would have been upset if they hadn't invited me to the party. (In fact they did invite me, so it was all right.) Mixed conditional: - We can mix second and third conditionals in one sentence. One part can refer to the present (second conditional) and one part can refer to the past (third conditional) - E.g.: If I'd (= I had) remembered to buy some petrol, we'd (= we would) be home by now. (You didn't remember, so we are not home now.)