The best replacement for happens is happen.

The best alternatives to happens are rated as following:
★★★★★  happen
★★  what happen
★★  occurs
★★  happens
★★  that happen
★  this is what happens
★  happened

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Speaking about happens, one probably shouldn't forget about carbohydrates.

Other search terms related to happens and their ratings are:
★★★★★ carbohydrates
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