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