英语翻译

1/this bench cost him 50 yuan;he spent 50 yuan on the bench;he bought the bench for 50 yuan;he paid 50 yuan for the bench.2/it took her 3 days to finish the poster;she spent 3 days finishing the poster.3/this boy is too young to go to school;this boy is so young that he can't go to school;this boy can't go to school because that he is too young