Sentence examples for I knew nothing from inspiring English sources

The phrase "I knew nothing" is correct and can be used in written English.
It is a grammatically correct sentence and can be used in various contexts. Examples: 1. "When I first started studying physics, I knew nothing about the subject." 2. "John was accused of cheating on the test, but he maintained his innocence by saying, 'I knew nothing about the answers.'" 3. "Despite his years of experience as a lawyer, George realized he knew nothing about international law." 4. "I went into the meeting completely unprepared, so when the boss asked me a question, all I could say was, 'I knew nothing about that.'" 5. "The detective was frustrated when the suspect refused to talk, claiming he knew nothing about the crime."