Like alleall, the quantifier beideboth is marginally able to carry noun ellipsis in subject and object position:

Instead, it requires a quantifier float structure, that is, a structure in which the quantifier appears as an adverb accompanying a pronoun:

The form beidenboth occurs proportionately, though not absolutely, more often with a human antecedent than the form beideboth. In the position of prepositional complement, however, it seems that a human interpretation for beidenboth is obligatory; so (d) above cannot refer to two inanimate subjects which are being talked about. This is independent of the presence of the quantifier: if only the pronoun harher, them is present, the judgments are the same. The object pronoun harher, them has a case-neutral clitic form seher, them. Both forms may show up as prepositional complement, but only harher, them may be accompanied by a floating quantifier:

Analogous to the form allegearreall, the form beidegearreboth also exists. Unlike allegearreall, beidegearreboth is almost obsolete. It occurs 11 times in the Frisian Language Corpus (25 million words). Some examples are provided below:

Example (4a) involves a case in which the adverb is used in a nominal position, accompanying the possessor pronoun, a position that is otherwise reserved for Noun Phrases (NPs). Example (4c) involves a case in which the adverb is not accompanied by a coreferring pronoun.

There is a weak tendency to interpret the form beidenboth as referring to persons, when compared to the form beideboth. The doubtful grammaticality indicates in this example that the judgments below hold for some speakers, but not for others:

The form beidenboth is obligatory in some constructions which can only refer to persons:

Constructions referring to persons and things exhibit either form, depending on whether persons or things are being referred to:

Beideboth is inherently a count noun. Alleall can also be used with mass nouns: