A couplet poem is made up of groups of two lines that flow together and frequently rhyme. In general, poems that can be divided into four lines of equal length are called "couplets." Six-line poems are also called "tercets" or "triplets." A couplet is the basic unit of poetic drama; each line consists of two feet of some sort, usually iambic pentameter but sometimes tetrameter or heptameter. Most six-line poems contain three couplets. Couplets are easy to write because they follow a simple pattern: ABBA CDCD EFEF GG. Where A stands for a strong syllable (usually an initial sound) B stands for a weak one (usually a final sound), C breaks the sequence down again, and so on. The last word in each couplet should be strong too. This way you don't get any weak words at the end of your line. When writing couplets it's important to keep the rhythm going. If you start a new line with a weak foot, then it will break the rhythm and the reader will lose interest. Use punctuation to indicate where one line ends and another begins - either a full stop or a comma is appropriate.