Mixed Conditionals and Real Life

Textbooks pretend conditionals are neat and separate. Real life mixes them. "If I had taken that job, I would be living in London right now" combines a past condition with a present result. This is called a mixed conditional, and it is not as hard as it sounds.

In casual conversation, native speakers often simplify conditionals. "If I knew, I'd tell you" can become "I'd tell you if I knew." The order can flip, and many people say "if I was" where formal grammar prefers "if I were".