回复:how to distinguish prep. and subordinate conj.
Your post is very difficult to answer bacause we don't know
1) whether you are talking about English or Chinese (or any other language);
2) whether you are talking about machine/software recognition/search or human recognition;
3) what you mean by "connectives/subordinate conj" (actually I kind of know what it means but different people may have different scopes in mind);
4) what you mean by "do it with gotagger";
etc.
Anyway, as has been discussed many times here, the more specific a question is, the more likely you'll get a useful response.