knowI know you've been hiding something from me.
be familiar withI'm very familiar with various accountancy software packages.
informedit's important to keep the public informed about the steps they're taking.
be apprised offormalThe suspect will be apprised of their rights.
realizeI realized that it was too late to stop them from finding out.
have heard ofMost Americans have never heard of the California Air Resources Board.
be aware ofThe Romans were aware of lead's toxicity.