they personal pronounactually adverbfunction verb, non-3rd person singular presentin preposition or subordinating conjunctiona determinerway noun, singular or massthat wh-determinercan modalpharmacologically adverboppose verb, base formmdma proper noun, singular's possessive endingactivity noun, singular or mass, so preposition or subordinating conjunctionthey personal pronoundo verb, non-3rd person singular presentn't adverbexacerbate verb, base form