Context: I am writing a short text to explain the main differences between Spanish passive sentences with "ser" and "estar", one of which is verb choice: sometimes the adjectival form should be chosen, and sometimes the participle form should. Those are generally the same, but sometimes they differ. The problematic sentence goes like:
Some examples where the participle and the adjectival form differ are: [and a list follows]
In a previous post, it was explained that the noun (form) can be either in singular or plural. Because the noun was a general thing, I decided to go with the singular form, but then a verb followed (differ). Now, my question is:
- Should the verb be conjugated in third person singular (differs) or plural (differ)?
Common sense tells me that it should be a plural (since there are two forms), but "differ" after "form" doesn't sound right (or does it?). I know I could just change form to forms, but I would like to keep it singular. Besides, I really am interested in knowing how the verb should be conjugated in this kind of phrases when the noun is to be kept in singular.