to remember or reflect on something from the past
recordar o reflexionar sobre algo del pasado (recordar o reflexionar sobre algo del pasado)
"When I think back to my first job, I realize how much I’ve grown."
"Cuando pienso atrás en mi primer trabajo, me doy cuenta de cuánto he crecido." (Cuando **pienso atrás** en mi primer trabajo, me doy cuenta de cuánto he crecido.)
to continue with an action until it is completed
to take action despite being afraid
to make many small mistakes because of nervousness
to mentally prepare for something challenging or frightening
to be very determined to get or achieve something
when the sky becomes covered with clouds