Going on foot

Many English learners make a common error when talking about their mode of transportation.

Let's say, I ask you the question: "How did you get here today?"

You can answer: "I came here...by car, by bus, by subway, by bicycle, by train, by taxi, by plane, by UFO, by jet, by rocket..."

However, if you are healthy or environmentally conscious, you might prefer to walk. In this case, the answer is not "by walking." The correct answer is: "on foot."

Still, if you want to avoid prepositions, you can use the expression "I took..." for public transportation. Example: I took a bus. I took a taxi. I took the subway. I took a ferry...