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 conjunctions

Correlative conjunctions work in pairs to join words and groups of words of equal weight in a sentence. There are six different pairs of correlative conjunctions:

1. either...or
2. not only...but (also)
3. neither...nor (or increasingly neither...or)
4. both...and
5. whether...or
6. just as...so

Examples:

• You either do your work or prepare for a trip to the office.
• Not only is he handsome, but he is also brilliant.
• Neither the basketball team nor the football team is doing well.
• Both the cross country team and the swimming team are doing well.
• Whether you stay or you go, it's your decision.
• Just as Aussies love Aussie rules football, so many Canadians love ice hockey.

 http://en.wikipedia.org/wiki/Conjunction_%28grammar%29