1) If I (be) you, I tell him the truth. (Type 2 Conditional) 2) If she (get) her diploma, she (work) for the UN. (Type 1 Conditional)
3) If they (invite) her, she (bring) a gift. (Type 3 Conditional)
4) If Peter (know) how to dance, he (win) the dance contest. (Type 2 Conditional)
5) They (not miss) their flight if they (take) a taxi. (Type 3 Conditional)
6) If you (heat) ice, it (melt). (Type 1 Conditional)
1. were ... would
2. gets ... will work
3. had invited ... would have brought
4. knew ... would win
5. wouldn't have missed ... had taken
6. heat ... will melt (хотя тут конечно подходит больше нулевой тип: heat ... melts)