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In Great Britain school begins at the age of five. At the age of sixteen the children usually leave school. So they spend eleven years there.
There are primary and secondary schools in England. When children are five, they go to primary schools. First they attend infant schools or infant classes. They spend two years there till they are seven.
Their classes are usually informal: they learn to read, count and write through different games. They sing songs, dance, look at pictures in interesting books, draw, learn to get on with their classmates. So their lessons are easy, not difficult.
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Why are classes in infant schools informal?