题目内容
8．这些书可以在网上订购．These books can be ordered on the Internet．
分析 These books can be ordered on the Internet．
解答 答案：These books can be ordered on the Internet．这是说可以，我们用情态动词can表示可以，能，再者这里的主语这些书these books是谓语订购order的承受者，构成被动关系，故用情态动词的被动语态--情态动词+be+过去分词，故These books can be ordered，后加上地点状语在网上on the Internet，故答案是These books can be ordered on the Internet．
点评 本题是情态动词语态的表达，我们首先要判断出主谓语的关系，然后根据语法得出答案
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