忘了这是个英语的什么句式了,

问题描述:

忘了这是个英语的什么句式了,
One should be responsible for their own choice and look after themselves shall they ever in danger.后面那个:'shall they ever in danger' 是个什么句式?怎么个用法?

这是倒装句.若虚拟条件句中含有were或had,should等助动词或情态动词时,连词if可以省略,将were,had,should提到前面.
这里还原回来,就是One should be responsible for their own choice and look after themselves if they shall ever in danger.