for those to have an impact if they do...请老师分析这里的语

This is the curfews came into effect in 10 French cities including here Paris from Midnight on Friday.

It's going to take some time though for those to have an impact if they do on the number of new cases.

搞不清语法成分和句意：for those to have an impact if they do ...麻烦老师逐一详解。谢谢！

for those to have an impact if they do ...

这是不定式复合结构作真正主语（it为形式主语）。those为指示代词，指代curfews, 即for the curfews to have an impact on ...

曹荣禄 -

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