251-275

1989

1945

1935

1979

To

Through

among

at

into

towards

between

through

developed slowly for many years

decreased during university studies

began as a child

came about unexpectedly

Jane

Dave

Alex

Grey

with better pronunciation

using a wider vocabulary

with actual understanding

using grammatical structures

2000

2007

2008

2004

do not motivate bird to learn

make the learning of complex tasks impossible

slow down the learning process

should be used only occasionally

American writer

Swedish writer

British poet

British writer

in 1876, California +

in 1889, London

in 1886, New York

in 1894, Alaska