Ладно. Не знаю, подойдет или нет, но все же:
1) old - older - the oldest
2) big - bigger - the bigest
3) simple - simpler - the simplest
4) expensive - more expensive - (the)most expensive
5) modern - more/less modern - (the) most/the least modern
+ запасные варианты:
good - better - (the) best
clever - cleverer - (the) cleverest
bad - worse - (the) worst