Many students trying to save money choosing to fill up water bottles with tap water rather than
问题描述：
Many students trying to save money choosing to fill up water bottles with tap water rather than
buying bottled water 这里为什么要用buying 啊rather than 前后不要一致么
答
动词的语态是要前后一致.所以用buying,因为前面用的是choosing.难道不是和choosing to 后面的FILL UP 一致么因为choose是动词，而且有个句型是choose to do somthing. 那么在这里就是choosing to fill up...("choosing" 相对应"buying",前后保持一致； 而"fill up"这边是保持原形="do", 不是"doing")