it personal pronounis verb, 3rd person singular presentall determinerabout preposition or subordinating conjunctioninteraction noun, singular or massbetween preposition or subordinating conjunctionthe determinerenvironment noun, singular or massand coordinating conjunctionthe determinerindividual adjective, we personal pronounhave verb, non-3rd person singular presentto toindividualise verb, base formwhat wh-pronounwe personal pronoundo verb, non-3rd person singular present.