Were they to arrive before we depart tomorrow,we should have a wonderful dinner.麻烦帮我分析一下这句话的句子成分,为什么前半句的结构会是这样,若不到装这句话应该怎样说

Were they to arrive before we depart tomorrow,we should have a wonderful dinner.麻烦帮我分析一下这句话的句子成分,为什么前半句的结构会是这样,若不到装这句话应该怎样说
Were they to arrive before we depart tomorrow,we should have a wonderful dinner.麻烦帮我分析一下这句话的句子成分,为什么前半句的结构会是这样,若不到装这句话应该怎样说

Were they to arrive before we depart tomorrow,we should have a wonderful dinner.麻烦帮我分析一下这句话的句子成分,为什么前半句的结构会是这样,若不到装这句话应该怎样说
前半句的倒装句是古典英文流传下来的句式,现在不多见,用来表达虚拟条件.这是比较文雅的表达方式.
Were they to arrive before we depart tomorrow
虚拟条件句=if they were to.
主句：
we should have a wonderful dinner.
主语：we
谓语动词：should have
动词宾语：a wonderful dinner
主从句配合：
从句：一般过去时+主句：过去将来时