She/he and I +verb

Question

Apparently a verb after "she and I" is conjugated as "we" (nosotros).

This is never really explained, though it appears numerous times in test questions (the explanatory material only re-iterates the original lesson).

Answer

Hola WilliamI am not sure which ones you're referring to as there isn't any precise information, but I can see that you may have been confused with this test-question where we use a subject that involves two people "Teresa y yo..." (Teresa and I..."), so this is the same as saying "Nosotros", therefore you need the verb conjugated in plural "sentimos". I imagine that is what you're referring to, not sure.Saludos

Answer

It is the same in English, i.e., it is plural; e.g. - "She and I are members of ..."

Answer

Or are you puzzled by the fact that it gets expressed in the first person plural [we] instead of in the third person?

In English [unlike in Spanish], there is of course no difference - we use "are" for both cases. However, if you think about it, it would sound odd to treat a "She and I..." combination as a "they..."