1) If I KNEW (known) I would phone her immediately2) If you HADN'T MISSED ( not miss) the tRain you would have arrived in time3) If they had known it before, they WOULD HAVE TAKEN (take) measures4) Your brother WOULD BECOME (become) much stronger it he took cold baths regularly5) It he didn't train (должно быть HADN'T TRAINED - Лиза, проверьте, правильно ли вы напечатали) enough last year, he WOULDN'T BE (be) a fIrst- class sportsman now6) If I HAD WRITTEN (write) the composition yesterday, I would be free now.или HAD I WRITTEN the composition yesterday, I would be free now.- если if опускается, то в предложении инверсия, у вас if в предложении отсутствует.