In its function as infinitive marker, to is not generally considered to be a preposition. Nevertheless, we consider all uses of to for adposition supersense annotation because infinitive clauses (infinitivals) can express similar semantic relations as prepositional phrases.
Most notably, infinitival purpose adjuncts alternate with for-PP purpose adjuncts:
The following list summarizes semantic analyses that we consider for infinitivals, which are detailed under Purpose:
Repeated from the discussion under Theme:
The non-semantic label `i applies to all other uses of the infinitive.
In #001, the infinitive clause has no local subject—rather, an argument of the matrix clause doubles as the subject of the infinitive clause (control). However, a separate subject can be introduced with for, in which case for+NP is treated as a dependent of the infinitive verb and labeled `i:
These occur in some English dialects: for to infinitives
Examples of infinitival tokens that do not receive a semantic label appear in `i.