knowI know you've been hiding something from me.
be familiar withI'm very familiar with various accountancy software packages.
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.
know ofHe said he knew of people who were considering returning to Mexico for college.
be aware ofThe Romans were aware of lead's toxicity.