这个句子是什么语法现象?
问题描述：
这个句子是什么语法现象?
its motions must certainly be directed by invariable laws; and could we imagine another world,it must also have constant rules
其中的and could we imagine another world,为什么情态动词could可以放在主语之前?
答
倒状不大可能,根据 it must also have constant rules,估计是问句,后面一句是回答前面一句的.