Final answer:
The correct PRETERITE conjugation for the -car, -gar, or -zar verb "tocar" for the subject "Ella y yo" is "tocamos".
Step-by-step explanation:
The correct PRETERITE conjugation for the -car, -gar, or -zar verb "tocar" for the subject "Ella y yo" is: tocamos.
In this case, the -car ending of the verb stem changes to -qu and the -gar ending changes to -gu in order to maintain the pronunciation. However, the -zar ending does not change.
Example:
Ella y yo tocamos la guitarra juntos en el concierto.
Learn more about Spanish verb conjugation