If Richard didn’t work such long hours, he wouldn’t be so tired.
If + Past Simple, would / wouldn’t Type 2 conditionals express an imaginary or improbable situation which is unlikely to happen in the present or future
What would you do if…. you saw someone robbing a bank? a shop assistant was rude to you? you fell over and broke your arm? you burnt your dinner? there was a power cut in your house? you caught a bad cold?
If I were an animal, I would be … a shark a ladybird I wouldn’t be …