Use coordination to combine each pair of sentences below into one sentence. Use a word or phrase that expresses the relationship shown in parentheses.

1.Most people collect stamps only as a hobby. Some people collect stamps as an investment. (contrast)
2.A stamp's rarity affects its value. The way the perforations are made affects the stamp's worth. (addition)
3.A stamp was missing a single perforation. Its value was greatly reduced. (result)
4.A stamp printed in British Guiana in 1856 is the world's rarest stamp. It is the most valuable stamp of all. (result)

3 answers

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Study these sites.

http://www.towson.edu/ows/conjunctions.htm

http://grammar.yourdictionary.com/parts-of-speech/conjunctions/conjunctions.html

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1. Most people collect stamps only as a hobby, but some people collect stamps as an investment.