![Membean Word Root Of the Day show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/025/719/small/membean-word-root-of-the-day.jpg)
Summary: Common prefixes like *in-* and *con-* sometimes change their form in English words. The prefix roots in _combine_ , _collate_ and _corrupt_ are all *con-*. Likewise the prefix roots in _illegal_ and _irregular_ are *in-*. This disguising of prefix roots is called *prefix assimilation*.