while preposition or subordinating conjunctionit personal pronoun's verb, 3rd person singular presentnot adverban determinerexact adjectiveanalogue noun, singular or mass, in preposition or subordinating conjunctionthis determinervideo noun, singular or masswe personal pronoun'll modalmake verb, base formcopper noun, singular or massformate proper noun, singular, a determineruseful adjectiveprecursor noun, singular or massto tocopper noun, singular or massconductive adjectiveink noun, singular or mass.
in preposition or subordinating conjunctionaddition noun, singular or massto toethyl verb, base formformate proper noun, singular, the determinercloud noun, singular or masscontains verb, 3rd person singular presentpropyl noun, singular or masscyanide noun, singular or massand coordinating conjunctionother adjectivechemicals noun, pluralthat wh-determinerare verb, non-3rd person singular present