Friends are people who come together to learn and grow with one another, to lighten each other's roads and to brighten each other's days.
to learn、to lighten和brightening结构不同。
平行结构中连词所连接的词语形式要保持一致，前文用的是to learn，to lighten故后面用to brighten。
Friends are people who come together to learn and grow with one another, to lighten each other's roads and to brighten each other's days.
句意：朋友是一起学习和成长，照亮彼此的道路，照亮彼此的生命的人。
