More and more people are treating used material so that it can be reused. 越来越多的人在处理使用 过的东西以便重新加以利用. Sam left work early so that he could take his son to a baseball game. 萨姆提早下班以便带他儿子去看棒球赛. I had to stay up late last night in order to finish writing this report. 昨晚我必须熬夜以完成这份报告. Carl exercises every day so as not to get fat. 卡尔每天运动以免变胖. There is no doubt that recycling helps (to)save our precious natural resources. 毫无疑问,资源回收有助于节省珍贵的自然资源. Policemen help (to) protect us against criminals. 警察帮忙保护我们免于罪犯之害. My mother often helps me(to) study for my exams. 我母亲经常帮我准备考试. Nancy usually helps her sister (to) do her chores. 南希常常帮他妹妹做杂务.