Herb, 
   
  The problem with these words is that they have the same form, so any attempt to include them in a lesson on how words can change form and also shift meaning would highlight the fact that these words do not change form.  From the point of view of a twelve-year-old, they are the same word since they have the same form, the same pronunciation, and can take the same slots in clauses and phrases.  They know that words have multiple meanings, so showing them how a word used prepositionally in one sentence has a different sense than its twin used participially in another is unlikely to be helpful.
   
  My main problem is that I myself do not see the difference between them.  Why would we call any of these -ing ending words prepositions at the head of a prepositional phrase when we could call them participles at the head of a participial phrase?  How could I tell when one is being used participially or prepositionally?
   
  Scott Woods
   
"STAHLKE, HERBERT F" <[log in to unmask]> wrote:
        v\:* {behavior:url(#default#VML);}  o\:* {behavior:url(#default#VML);}  w\:* {behavior:url(#default#VML);}  .shape {behavior:url(#default#VML);}                Scott,
   
  The key part of your question is making the facts clear to 7th graders.  The problem arises because we have two words spelled the same and apparently having the same morphological analysis.  The roots of these words have meanings as verbs that are different from the meanings they have in compound prepositions.  Would it be possible to present them as part of a lesson on morphological derivation and productivity?  We can add –ness to lots of adjectives and get nouns that are semantically transparent, that is, the word becomes a noun that names the quality described by the adjective.  But adding –ant or –ent to a verb produces adjectives that frequently are not semantically transparent, that is, that don’t simply treat as a quality or characteristic the meaning of the verb.  Consider abound/abundant, compete/competent, confide/confident, ignore/ignorant, etc.  In these cases, whether because the stem vowel changes or because the meaning of the derived adjective is not
 predictable from the combination of stem plus suffix, the derivational morphology is not productive.  Obviously this presentation is a little dense for 7th graders, but I suspect it could be simplified, and in the process they’d learn something of word derivation and the concept of productivity.
   
  Herb
   
    From: Assembly for the Teaching of English Grammar [mailto:[log in to unmask]] On Behalf Of Scott Woods
Sent: Sunday, October 07, 2007 6:06 PM
To: [log in to unmask]
Subject: preposition versus present participle

   
    Listmates,

     

    In a number of texts (Greenbaum's, Kolln & Funk's, Warriner's, among others), several -ing ending words which seem to be participles of verbs are listed among the prepositions. These include according to, concerning, considering, following, failing, and including. What is the distinction between prepositional phrases beginning with such words and participial phrases beginning with similar -ing participles?  Can the same word function as either a preposition or a participle, depending on how it is used? Are there any suggestions for how this might be explained to bright 7th graders?  

     

    Thanks,

    Scott Woods

    
    
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