attend in Spanish means asistir (a clases, a un curso...) not atender
constipated in Spanish means estreñido-a not constipado-a
exit in Spanish means salida not éxito
fabric in Spanish means tejido / tela not fábrica
to pretend in Spanish means fingir not pretender
to realize in Spanish means darse cuenta / cumplir not realizar
stranger in Spanish means desconocido-a / forastero-a not extranjero-a
success in Spanish means éxito not suceso
Imagine if someone says: "I'm constipated" (estoy estreñido) and what he really wants to communicate is: "I've got a cold" (estoy constipado).
Another example: "I went to the Giraldillo library to buy El Quijote". What this person means is not a library but a book-shop.