Best way to figure out pattern in tree structure

Question

This question is extension to Identifying preposition or conjunction

Have a look at this tree :

I have figured out that if parent of an IN is SBAR then it is conjunction, if it is PP then it is preposition.(I assume IN always comes to the left of SBAR or PP).

However, I am not able to iterate over tree in such fashion sucessfully.

I am not sure about these things : 1. Am going right way to separate conjunctions and prepositions? 2. At first glance I thought this logic was going correctly

as SBAR > IN > because === conjunction PP > IN > with === preposition

But, Have a look at this sentence

I guess I’ll never be the same since we fell for you

So, Now I think this logic will be correct

if SBAR > iterate again ... left side child find IN then mark as conjunction.

Please guide me how can I go about it. I dont have much knowledge about Tregex, Semregex or Tsurgeon. Will it be helpful in this scenario? Please give some examples of how to correctly iterate over a tree .

Answer 1

The easiest solution is probably to look at the dependency parses.

Actual prepositions will be attached to their heads with a case relation, while subordinating conjunctions will be attached to their heads with a mark relation.