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.