1773. The subjunctive is used in indirect questions or exclamations.
Thus, when the direct question, #quī scīs#, _how do you know?_ is
subordinated to a main sentence, such as #quaerō#, _I ask_, the #scīs#
becomes #sciās#: #quaerō quī sciās#, _RA._ 59, _I ask how you know_.
Questions or exclamations thus subordinated are called _Indirect_
(1723). In English, indirect questions are usually characterized simply
by the position of the words, the subject standing before the verb.
1774. The indirect question is one of the commonest of constructions. It
depends on verbs or expressions meaning not only _ask_, but also _tell_,
_inform_, _ascertain_, _see_, _hear_, _know_, _consider_, _deliberate_,
_doubt_, _wonder_, _fear_, &c., &c.