If the question is: How do people travel to the local shopping centre?
As an answer, can I say ´´by bus, by car, by walking´´. Are ´´by walking´´ and ´´by car´´correct? It doesn´t sound right to me. Is there a different (maybe more natural) way of saying that?
Thanks :)

Question

Answer

on foot
or
they walk

Answer

One would say 'on foot' not 'by walking.' In English there are always exceptions to rules :-)

Answer

All your examples are perfectly fine ways to answer the question, but to sound more natural, I would suggest:

They take the bus.

They drive.

They walk.

Verpassen Sie nicht die Gelegenheit, bequem von zu Hause aus eine Sprache zu lernen. Stöbern Sie in unserer Auswahl an erfahrenen Sprachlehrern und melden Sie sich jetzt zu Ihrer ersten Unterrichtsstunde an!