c1;we can't bathe in this part of river because the water is too dirty
->if the water weren't too dirty, we could /would have bathed in that part of river
c2;we spend too much money on electricity because we have four air conditioners in our house;
->if we didn't have four air conditioners in our house , we wouldn't spend too much money on electricity
c3 ;I can't write to Linh because I don't have her address
-> if i had linh's address, i could write to Linh
c4;Dick often causes accidents because he drives carelessly
-> if dick didn't drives carelessly, he wouldn't cause accidents
c5 we can't give much help to the poor because we waste alot of money on unnecessary things
-> if we didn't waste alot of money on unnecessary things, we could give much help to the poor
c6; without this treatment the patient would have died
-> if the patient had treated , it wouldn't have died
c7; we got lot because we didn't die
-> if we had died, we wouldn't have gotten lot
c8; he lost his job because he was late every day
-> if he hadn't been late every day , he wouldn't have lost his job