Correlative expressions consist of two parts. They may belong to various word classes.
Some examples :
Correlative conjunctions - eg not only / but also, if / then etc
Correlative prepositions - eg from / to, neither / nor
Correlatives may also mix word classes as in the expression as (adv) / as (preposition)
Correlative conjunctions - eg not only / but also, if / then etc
- She not only got 100% on the test, but also finished in half the time allowed.
- If he refuses, then we'll need to change our plans.
Correlative prepositions - eg from / to, neither / nor
- We're open from 9 to 5.
- Neither Ann nor Paul wanted the job.
Correlatives may also mix word classes as in the expression as (adv) / as (preposition)
- He's as stubborn as a mule.