8. hear of -- have some knowledge of e.g. I had never heard of Singer until he won the Nobel Prize in 1991 i gave the taxi -driver the name of the street where the hotel was located but he said he had never heard of it8.hear of --- have some knowledge of e.g. I had never heard of Singer until he won the Nobel Prize in 1991. I gave the taxi -driver the name of the street where the hotel was located , but he said he had never heard of it