تَارَةً: مَرّةً once

تَارَةً: أحْيَاناً sometimes, at times

تَارَةً... وتَارَةً، تَارَةً... وطَوْراً sometimes... and sometimes, at times... and at other times

بَيْنَ تَارَةٍ وأُخْرَى from time to time, now and then, once in a while, occasionally, sometimes, at times