For every hour they skate,each student raises ten yuan for charity.句首for的用法是什么

They usually ()(run)for half an hour every morning. .For every hour they skate?For every hour they skate,each student raises ten yuan for charity.这里的for起什么作用?翻译成什么? 请问“For every hour they work,they can get thirty dollars?前半句是倒装句吗?还是? For every hour they skate ,each student raises ten yuan for charity For every hour they skate ,each student raises ten yuan for charity every和each能互换吗? They do their homework for half an hour every day 改为否定句 For every hour they skate,each student raises ten yuan for charity.句首for的用法是什么 they usually _____(run) for half an hour every morning用适当形式天空 应该用 run 还是running 为什么 For every hour they skate,each student raises 10 yuan for charity.请解释for在这里的用法不好意思，没说清楚，是开头的那个 because they piay basketball for an hour we read english for half an hour every day(对for half an hour提问） Linda does her homework for about for about an hour every dayfor about an hour 划线 we play basketball for an hour every day 对for an hour提问 they walked for.A,an hour B.half a hour C,half an hour 选哪个 I read English for a hour every morning 改错 I usually walk for ______half an hour every day. keep reading english texts for about an hour every day We have sports for two _______ (hour) every day.