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虚拟语气的将来时怎么用?给个例句叭~

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虚拟语气的将来时怎么用?给个例句叭~
表示对将来情况的主观推测
从句:①if+主语+were to do (if 表示未来的虚拟语气独有该形式,其他如wish,even if等词都没有该形式来表示未来的虚拟语气)
②if+主语+should+do
③if+主语+过去式(be动词用were)
主句:主语+should/would+do
eg:
1.If he should come here tomorrow,I would talk to him.
如果他明天来这儿的话,我就跟他谈谈.(事实:来的可能性很小,不可能)
2.If there were a heavy snow next Sunday,we would not go skating.
如果下周日下大雪,我们就不能去滑冰了.(事实:下雪可能性很小,不可能)
3.If she were to be here next Monday,I would tell her about the matter.
如果她下周一来这儿的话,我就会告诉她这件事的始末.(事实:来的可能性很小,不可能)