The comparative form of "forth" is "further," and the superlative form is "furthest." These forms are used to compare the degree or extent to which something is done or exists in relation to others. In this case, "forth" is being compared to other distances or extents.
The comparative is greater and the superlative is greatest.
comparative straighter and the superlative the straightest
Comparative - better Superlative - best
Comparative - cuter Superlative - cutest
"Bit" is a noun and a verb and, as such, does not have a comparative or superlative form.
comparative : purer superlative : purest
Comparative: older Superlative: oldest
Dative; Early Comparative; Earlier Superlative; Earliest
The comparative and superlativeforms of grand are: Comparative: grander Superlative: grandest
comparative - merrier superlative - merriest
comparative = sadder superlative = saddest
The comparative is "stricter" and the superlative is "strictest".
Comparative: shallower Superlative: shallowest
The comparative is greater and the superlative is greatest.
comparative straighter and the superlative the straightest
Comparative is more and superlative is most.
comparative is calmer superlative is calmest