Old–older/elder–oldest/eldest 　　Safe–safer–safest 　　Young–younger–youngest 　　Well–better-best 　　Useful–moreuseful–mostuseful 　　Pretty–prettier-prettiest 　　Good–better-best 　　Friendly–friendlier–friendliest 　　Hot–hotter-hottest 　　Busy–busier-busiest 　　Healthy–healthier-healthiest 　　Lovely–lovelier-loveliest 　　Beautiful–morebeautiful–mostbeautiful 　　Fat–fatter-fattest 　　Interesting–moreinteresting–mostinteresting 　　Convenient–moreconvenient–mostconvenient