when have all the flowers gone句式对吗?

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whenhavealltheflowersgone句式对吗?whenhavealltheflowersgone句式对吗?whenhavealltheflowersgone句式对吗?不对,如果问when

when have all the flowers gone句式对吗?
when have all the flowers gone句式对吗?

when have all the flowers gone句式对吗?
不对,如果问when不能用完成时.而且花谢应用be gone,而不是have gone
when are all the flowers gone.