Ils ont fait empirer leurs caries pour avoir mangé trop de bonbons.

Questions & Answers about Ils ont fait empirer leurs caries pour avoir mangé trop de bonbons.

Why does this sentence use pour avoir mangé instead of just pour manger?
Because the action of eating candies happened in the past, before the cavities worsened. To express a completed cause, French uses pour followed by the past infinitive (avoir or être + past participle). If you used pour manger, it would mean "in order to eat" (a goal), rather than "for having eaten" (a past cause).
Could I just say parce qu'ils ont mangé instead of pour avoir mangé?
Yes, parce qu'ils ont mangé is perfectly correct and means "because they ate". Using pour + past infinitive is just a slightly more elegant and concise way to express this cause-and-effect relationship.
Why use the phrase ont fait empirer instead of just ont empiré?
The verb empirer can mean both "to get worse" and "to make worse". While you can use it directly (ils ont empiré leurs caries), the causative construction faire + infinitive (ils ont fait empirer) puts more emphasis on the fact that their habits caused the situation to worsen, rather than them acting on the cavities directly.
Why is it trop de bonbons instead of trop des bonbons?
Even advanced learners occasionally slip up here! Remember that adverbs of quantity like trop, beaucoup, and assez are always followed by a simple de (or d'), rather than the plural article des. You would only use des after trop if you meant "too many of the specific" candies.

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