By – por
(Pronounced poor)
To remember that by is pronounced poor (por) in Spanish, use the following mnemonic:
By having by-pass surgery, he hoped to improve his poor (por) health.

Examples of por (by) in a sentence
El tren pasa por el túnel cada mañana.
(The train goes by the tunnel every morning.)
Fue escrito por un autor famoso.
(It was written by a famous author.)
Caminamos por el parque al atardecer.
(We walked by the park at sunset.)