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310.

Quis, quispiam, aliquis, quídam, are particular indefinites, meaning some, a certain, any. Of these, quis, any one, is least definite, and quídam, a certain one, most definite; aliquis and quispiam, some one, stand between the two: -

a. The indefinite quis is rare except in the combinations sí quis, if any; nisi quis, if any ... not; ne quis, lest any, in order that none; num quis (ecquis), whether any; and in relative clauses.

b. The compounds quispiam and aliquis are often used instead of quis after sí, nisi, ne, and num, and are rather more emphatic: -