Functional words (individual, unique) arranged in 15 classes
• A – determiners (the same position as the with Class 1 words);B – modal & auxiliary verbs (occur with Class 2 words);C – not D – very-type words (occur with Class 3 words);E – conjunctions;F – prepositions; G – do;H – introducers (there, it);I – interrogative (wh-words);J – connectives of clauses (whenever, so, and, since);K – interjections;L – yes and no;M – attention getting signals (look, say, listen);N – please(formula of politeness);