快速答案
concerto 指音乐会或协议；conserto 指修理。
可靠的方法是先判断这个词在句子里的功能，再翻译。
每个词的作用
concerto
concert or agreement
Use concerto for a musical performance or, in formal use, coordination and harmony.
conserto
repair
Use conserto for the act or result of fixing something damaged or faulty.
如何选择
- concerto: Choose concerto if the sentence points to a musical performance or, in formal use, coordination and harmony.
- conserto: Choose conserto if the sentence points to the act or result of fixing something damaged or faulty.
例句
O concerto começa às oito.
The concert starts at eight.
O conserto do elevador demorou dois dias.
The elevator repair took two days.
常见误区
The verb follows the same split in spelling: concertar can coordinate, while consertar means repair.
放到语境中练习
从你的真实生活中选一个句子，写两遍：一次用 concerto，一次用 conserto。如果两个版本都可以，说明意思怎样变化。