Buy- sell ,Beautiful-ugly,Poor-rich Interesting-boring,Good-bad,Weak-strong,True-false, Easy-hard/difficult, Fast-slow, Strong- weak,Cheap-expensive, Happy-sad, Miss a bus-catch a bus, Downstairs-upstairs, Wet-dry,Clean-dirty, Long-short,Short-long, Old-young/new, Busy-free,Behind-in front of,Round-square,Comfortable-uncomfortable,Big-little/small,Cold-hot.