SF           sentence + fragment

                                                                                (needs no comma)

                                                            John spoke to me today.

F,S          fragment + , + sentence (needs a comma)

                                                            Today, John spoke to me.

                                                             After today, I will sleep better.

S;S         sentence + ; + sentence (links closely related sentences)

                                                                                My kitty scares many people; it is a purple lion named Fluffy.

                                                                                I stand amazed at the Milky Way;

                                                                                Its stars line black night’s nape like the most exquisite strand of pearls.

S,ccS      sentence + , + (f.a.n.b.o.y.s.) + sentence  (links sentences)

                                                                                I spoke with John, but he didn’t speak to me.

                                                            Mary hates cats, yet she tries to be kind to them.

S;ca,S     sentence + ; + conjunctive adverb + , + sentence

                                                                                CA = (however, moreover, finally, furthermore, hence, nevertheless, similarly)

                                                             or other transition (in fact, in other words, in addition, even so, for example)

                                                            I prefer to eat meat; however, I will eat broccoli)

S:S      sentence + : + sentence (links to a sentence that summarizes the previous sentence)      

                                                                            I like to bungee jump: I like to live life on the edge.