Correlatives

Certain adverbs and conjunctions, in comparison or antithesis, require the use of corresponding adverbs and conjunctions. Such corresponding words are called correlatives. The following are the principle ones in use in English:

as ...as
not merely ... but also
as ... so
not merely ... but even
both ... and
so ... as
if ... then
so ... that
either ... or
such ... as
neither ... nor
such ... that
not only ... but
though ... yet
not only ... but also
when ... then
not only ... but even
where ... there
not merely ... but
whether ... or

In Latin such phrases are usually clear to spot through the patterns they form:

Demonstrative Relative Interrogative Indefinite Indefinite Relative
marker t- qu- / c- qu- aliqu- doubled / -cumque
-antus tantus: so much, great quantus: as much, great quantus?: how much, great? aliquantus: some quantuscumque: however much, great
-alis talis: such, of such a kind qualis: as qualis?: of what kind? qualiscumque: of some sort
-um tum: then cum: when quando?: when? aliquando: sometimes quandocumque: whenever
-ot tot: so many quot: as many quot?: how many? aliquot: some quotquot: however many
-otiens totiens: so often quotiens: as often quotiens?: how often? aliquotiens: sometimes quotienscumque: however often

Other useful vocabulary:

ita thus, in such a way
sic thus
adeo thus