Usu is an abbreviation for the word "usually." When you want to express frequency or habit, you can replace "usu" with various synonyms. Some examples include frequently, typically, ordinarily, regularly, customarily, traditionally, commonly, and usually. Each of these words carries a slightly different connotation, so selecting the right one depends on the context of your sentence. For instance, if you are discussing a recurring event, "regularly" could be a better choice. But if you want to indicate something that happens as a routine, you could choose "traditionally" or "customarily." Overall, comprehending the nuances of each synonym enhances your writing by providing a varied breadth of vocabulary.