Correlate Conjunctions are always used in pairs.

They show the relationship between the ideas expressed in different parts of a sentence.

Examples:

Both...and             Both Susan and her sister are in the forest now

Not only...but also  He not only smokes but also drinks every day

Rather...than         He is very honest.He would rather starve than steal

Either...or              Either you or she must wash the window in the kitchen

Whether...or          When I heard about it  I didn't know whether to laugh or cry

Neither...nor          Neither Eva nor Silvia go on holiday this year

Such...that            They are such nice people that we can visit them next week

As...as                  She comes to visit her grandparents as often as she can

Not...but               Not Ela but her sister is owner of the big flat

test yourself:

....... my father and my mother are learning Spanish.

In my opinion, his sister is ........ clever nor nice.

Last year they visited ........ France but also Spain.

He'd........ go to the cinema than to the opera.

We're going not ...... to the cinema but also to the concert.

Roger couldn't decide ....... to buy the white socks or the blue ones.

My children are ....... in the garden or in the park. 

We're going to Kolobrzeg on our holiday, not to Sopot. Kolobrzeg isn't ....... expensive as Sopot. 

She is ........ a nice that I think you will marry her soon.

........she but her sister worked in England as a nurse last year.

You need to decide ....... you want to marry Tom or Tim.