这个句子是什么语法现象?

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?
英语人气:827 ℃时间:2020-01-28 19:36:50
优质解答
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.
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