Student or Learner
Plastic bags burn with a very bad smell.
I understand with plural we don't change the base form of verb i.e. we don't add "s" or "es". So we have used "burn" not "burns". Am I correct?
I understand we add article only before noun. I could not understand why have we used "a" before "very". Please clarify.
You are correct about the verb.
We use articles before a noun phrase, a word or phrase of which the headword is a noun. The noun phrase in your example is a very bad smell -