Have you ever felt ill after you've eaten something? Yes? Then you've probably had food poisoning. Food poisoning is an illness which you can get when you eat food that contains bacteria, viruses or parasites, which enter the stomach and intestines. This is called a foodborne illness. Common symptoms of foodborne illnesses are diarrhoea, vomiting, headaches and fever.
The two most common foodborne illnesses are campylobacter and salmonella. Both of these are bacterial foodborne illnesses and we sometimes find them in raw (uncooked) meat (especially chicken and turkey), milk, eggs and unclean water.
You can get food poisoning from food which has not been cooked properly or because of cross-contamination. This is when bacteria spread between different foods,
surfaces or kitchen equipment. For example, when you prepare raw chicken on a surface and don't clean it before using the same surface for other food like salad or cooked meat. Another danger is when you keep raw meat above other food in a fridge and liquid from the raw meat falls on to the food below.
Объяснение:
Eton had been working for 20 years before he retired
Mike had been living there for a tonight
They had been studying German for 5 years before they went to Berlin
The authors had been working on the novel for 2 years before the sent it to a publisher
Pele had been playing football for 6 years before...
The students had been listening attentively to the dialog for an hour ...
The children had been walking for 2 hours..
(вместо точек просто продолжение предложения без изменений)