An adverbial clause of manner is a subordinate clause in adjunct function, i.e. modifying the main-clause predicate, and specifying its manner. It bears an adverbial relation to the main predicate analogous to a local or temporal clause. A manner clause may be paraphrased by a correlative construction of the type ‘so/the same way ... as S’ (a).

An equiparative clause, or comparative clause of equality, is a subordinate clause modifying a dependent of the main-clause predicate, generally an adjectival or adverbial. An equiparative clause S depending on a head A may be paraphrased by a correlative construction of the type ‘equally A as S’ (b).

If an equiparative clause depends on a manner adverbial, it differs from a manner clause only by the presence of this adverbial (b); without it, it would be a manner clause (#a).