to make a sincere promise
hacer una promesa sincera (hathir una promesa sincera)
"I’ll never tell anyone, cross my heart."
"Nunca le diré a nadie, te lo juro." (Nunca le diré a nadie, **te lo juro**.)
to find small, unimportant faults in something
an unpredictable person who may cause problems
to contact or communicate with someone
to stop being loyal or trustworthy
extremely intense and ruthless competition
to make a mistake; to fail at something important