It is 'imperative' that the public be informed about these dangers. = It is 'imperative' to inform the public about these dangers.
“Go” and “buy” are 'imperatives' in the sentence “Please go to the store and buy some milk.”
She considers it a moral 'imperative' to help people in need.
(..) I put it beside his bed. He hasn't even noticed. Robert... ...we need to talk about a power of attorney. - I know this is hard, but it's imperative... - Not now, Uncle Peter. EAMES: The vultures are circling. And the sicker Maurice Fischer becomes, the more powerful Peter Browning becomes. (..)2010 Inception