When it comes to synonyms for the phrase "is common," there are several options to choose from. Some examples include "widespread," "frequent," "ubiquitous," "prevalent," and "rampant." Each of these words describes a situation where something is occurring often or is generally accepted as normal or expected. Other options might include phrases like "happens frequently," "is routine," or "is a regular occurrence." By using these synonyms, writers and speakers can add nuance and variety to their language while still conveying the same basic meaning. Depending on the context, different synonyms may be more appropriate and effective, so it's important to choose carefully.