ruin

BE + sure | certain + to INFINITIVE

In this post, we explore modality with two adjectives followed by infinitives. Here is an imperative example of telling someone with emphasis not to forget or fail to do something: Be sure to check the weather  before you go to the airport. listen And here is an extremely advanced modification of an assertion, a bit like a negative superlative comparison:   There’s nothing more certain to ruin a beautiful relationship than marriage.

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