Conjunctions...... There was a program on edcuational TV in the USA and the theme sond was 'Conjunction Junction what's your function" . In English most conjunctions are a closed set . Some conjunctions just add two things together and others do more than connect. The biggest class of conjuctions are subordinating conjunctions. They connet phrases to the main sentence. They are generally adverbs functioning as conjunctions. Although conjunctions are generally a closed class subordination conjunctions are not . They are used to subordinate a clause to a main sentence.