um... I'm pretty sure it's more helpful and the most helpful?
The superlative form of clean is "cleanest".
comparative - merrier superlative - merriest
the superlative form of sad is SADDEST
Longest is the superlative.
No, the superlative form is "gentlest."
more useful, most useful
The superlative of terrible would be most terrible.
more useful, most useful
most useful
more useful and most useful
more useful, most useful
A;more useful B;most useful
the superlative form for movingly in most movingly
Most useful and more useful.
more useful, the most useful
The superlative form of ancient is ancientosity
The superlative form of clean is "cleanest".