【素养提升】2018-2019学年译林版高中英语必修一:Unit1 School life Reading-Language Points-2
【素养提升】2018-2019学年译林版高中英语必修一:Unit1 School life Reading-Language Points-2第2页

10. …so I could e-mail my family and friends back home for free. free adj. 免费的;空闲的 a free dinner 免费的午餐 for free (= free of charge) 免费的 free time 空闲时间 All the books were given away free. 所有的书都免费赠送。