Answer:
We must complete some sentences here:
1) Marcela / leer el correo electrónico
First we must identificate the person, here is Marcela, and the person would be "ella", the verb is "leer", and a correct way to conjugate this would be (in present tense)
Marcela lee el correo electrónico.
2) José y Francisco / dormir
Again, the person here are "José and Francisco", so the person would be "ellos", the verb is "dormir", and the conjugation in the present tense is:
José Y Francisco duermen.
3) Yo / preparar sándwiches
Now, the person is "yo" and the verb is "preparar", the conjugation in the present tense is:
Yo preparo sándwiches.
