1. If I had enough money, I would travel around the world, but I don’t have enough money.2. If I were (was)you, I would accept their invitation, but I’m not you. 3. If we lived in a town, life would be more interesting and easier, but we don’t live…4. If I were (was) rich, I would spend all my time travelling. 5. If he were (was) here, he would help us, but he is not here.Это всё условные предложения второго типа. Форма глагола "to be"-"were" используется со всеми лицами, однако, учитывая современную тенденцию с 1 и 3 л.ед.ч. допускается использовать "was". Этот вариант дан в скобках, но он менее предпочтителен.