Jon has a hundred CD's at least , yet he never plays one. Writing is a difficult subject , so many students put off taking Composition. Students who . As you can see from this example, this is a good kind of sentence to write when you want to present a comparison or parallel of some kind. You can not write Students are willing to work hard, but they hate to work on trivial assignments.
Students are willing to work hard, they, but , hate to work on trivial assignments.
Students are willing to work hard, they hate to work on trivial assignments, but . To put it more bluntly, SV, SV is never correct. LOOK at this list. You can think of more words that are used like these to add to it. Add three or four.