... humans -The adjective “harmful” is followed by the preposition “to” -Many adjectives are used with particular prepositions and these must be learned by heart “to” following such adjectives as ... Compare: *Thank you It was very kind of you to help me *You are very kind to me “of” following such adjectives as afraid, ahead, aware, capable, confident, full, fond, proud… *“Are you afraid of dogs ... wasn’t aware of that.” (Bạn có biết họ lập gia đình chứ? – Không, điều đó.) “for” following such adjectives as available, difficult, late, perfect, famous, responsible, useful… *Florence is famous...