conjunctions which are used in pairs are known as correlative conjunctions:
Ex : Either - sot Such -sthat Neither - nor
As - as Both - and As - so
Thought - yet So - than
Not only - but also Hardly - when
Such - as Scarecely -when
No sooner - than
a) Either - or
John is either a typist or a taxi driver.
b) Neither - nor
She can speak neither English nor French.
c) Both - and
He is both handsome and clever.
d) Though - yet
Though he tried to convince his wife, yet she was not happy with his words.
e) Whether - or
I don't know whether she will marry him or continue with her studies.
f) Not only - but also
He not only wrote the song but also sang it well.
g) Such - as
i read such books as increase my knowledge.