Old - older - the oldest; Dirty - dirtier - the dirtiest; Much - more - the most; Fast - faster - the fastest; Safe - more safe - the most safe; Interesting - more interesting - the most interesting; Important - more important - the most important; Exciting - more exciting - the most exciting; Quick - quicker - the quickest; Slow - slower - the slowest; Hot - more hot - the hottest; Popular - more popular - the most popular;
