Families have also experienced changes these years. More families consist of one parent households or two working parents.
句中,household为什么要使用复数households?可否使用单数household?
又如,老师对学生们说,把书翻到第十页,应该说Open your books at page 10, 还是Open your book at page 10 ?
同学们举起了手,应该说The students raised their hands/hand?
以上问题,应该是一类问题,请老师分析,谢谢!