＿,we shall go on a picnic这里为何一定要用 should the weather be fine 不能用 were the weather to be fine

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＿,weshallgoonapicnic这里为何一定要用shouldtheweatherbefine不能用weretheweathertobefine＿,weshallgoonapicnic这里为何一

＿,we shall go on a picnic这里为何一定要用 should the weather be fine 不能用 were the weather to be fine
＿,we shall go on a picnic
这里为何一定要用 should the weather be fine 不能用 were the weather to be fine

＿,we shall go on a picnic这里为何一定要用 should the weather be fine 不能用 were the weather to be fine
关键词在于【shall】.
表示“未来”的虚拟语气,所以必须用should.
例子：
Should the weather be bad,we shall/will have to move the meeting to another date.
“were”代表的是“过去”的虚拟语气,如果要用were的话,句子就得改成：
Were the weather fine,we could/would have gone on a picnic.

不解释!是谁说的 不能用were the weather to be fine？？？再者，我想问问楼主，shall是不是写错了，应该用should才对？

虚拟语气

两个都不对。可以说if the weather is fine, we shall...

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