How to use could in a sentence. We all have experienced the serendipity of relevant information arriving just when we were least expecting it. Lessons From The Past Serenity Quotes Incredible Quote Observation Quotes Serene definition calm peaceful or tranquil. . Meanings Synonyms Sentences Nature has created a wonderful serendipity. It was only through pure serendipity that I. The most voted sentence example for could is I wish you could hear yourself. Example sentences with the word could. Serendipitous definition come upon or found by accident. A serene landscapeserene old age. The formerly serene wooded region of Ardennes was hacked into chaos by fighting as the Americans dug in against the German advance at St-Vith Elsenborn Ridge Houffalize and later Bastogne.