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1- mice don't catch cats.  cats catch mice. 2 - the eath doesn't go round the moon.  the earth goes round the sun. 3 - the river  volga  doesn't flow into the black sea.  the river volga flows into the caspian sea. 4 - patients don't look after nurses in hospitals.  nurses look after patients in hospitals. 5 - water doesn't boil at 50 degrees centigrade.  water boils at 100 degrees centigrade. 6 - indians don't live in scotland. indians live in america. 7 - carpenters don't make things from metal. carpenters make things from wood. 8 - our city doesn't stand on the river thames. our city stands on the river moskva. 9 - it doesn't often rain in africa. it often rains in mexico. 10 - tigers don't eat grass. tigers eat meat. 11 - our group doesn't study chinese. our group studies english. 12 - our classes don't begin at 8 a.m. every day. our classes begin at 8 a.m. five days a week.