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1)I think oranges are tasty but plums are tastier and bananas are tastiest.
2)The USA is big but Canada is bigger and Russia is the biggest.
3)November is cold but December is colder and January is the coldest.
4)I think nice are friendly but cats are friendlier and dogs are friendliest.
5)Clowns are cute but dolls are cuter and teddy bears are the cutest.
6)Evenings are dark but late evenings are darker and nights are the darkest.
7)Days in early autumn are bright but days in late spring are brighter and days in summer are the brightest