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How will a Do-So test help in identifying if a PP is an adjunct or complement to the verb? Example : I ran to work. I need two pieces of evidence to prove the status of PP in a sentence.

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Recall that in English, adjunction is believed to look like this:

Syntax tree \VP \V' \V' \V ran\ \ \PP to work\ \ \

If the lower V' is a constituent, then we should expect it to be substitutable by 'do so' in the standard test, but we can't say that:

#I did so to work. (meaning 'I ran to work')

By contrast, you can substitute the whole thing 'ran to work' with do-so:

I went to work on Thursday.

I did so on Thursday.

This suggests that 'on Thursday' is an adjunct and 'to work' is the complement, i.e. this structure is appropriate:

The other tree

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  • Caution: Identification of adverbial phrases is ambiguous (unless marked by a comma). I ran, [in order] to work [out]. I worked on Thursday['s edition of the newspaper]. – amI Mar 29 '17 at 21:39
  • @amI But if the meaning's evident then the structure is not ambiguous. – Araucaria - Not here any more. Mar 29 '17 at 22:49
  • Many grammarians use "licensing" to determine whether an element is a complement or an adjunct/modifier. Essentially, an element has to be "licensed" by an appropriate head to qualify as a complement. – BillJ Mar 31 '17 at 7:15
  • @BillJ I agree that's a useful test, but the OP asked for do-so, so I... lowers glasses did so. – WavesWashSands Mar 31 '17 at 15:34
  • The 'do-so' test merely shifts the tense to an auxiliary and replaces the verb with a pronoun (so, it, that, ...). It is only good for identifying the direct object, since we only expect un-case-marked objects after an actual verb. Thus 'I ate the cake' becomes 'I did so to the cake'. "I did so to work" is not ungrammatical; it is merely clunky because 'to' is poly-semantic. – amI Apr 6 '17 at 20:44

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