Nosotros imperative with double object pronouns

Question

¿Se quita la s del imperativo de nosotros cuando "selo" lo sigue?  Por ejemplo: mostremosselo o mostremoselo

Answer

Hola Stephen R.
In Spanish, when using the "nosotros" imperative with double object pronouns, the final "-s" of the verb ending "-mos" is dropped if the pronouns "se" or "nos" are attached to the verb.
For example, the correct form of "mostremos" + "se" + "lo" becomes "mostrémoselo" (let's show it to him/her/them). The final "-s" from "mostremos" disappears when "se" is added. This is a standard grammatical rule designed to simplify pronunciation.
The "-s" is removed to avoid awkward or difficult-to-pronounce combinations like "mostremosselo." This adjustment makes the word smoother and easier to say.
More examples:

Digámoselo. (Let’s tell it to him/her.)
Enviémoselo. (Let’s send it to them.)
Mostrémoselo. (Let’s show it to him/her.)
Démoselo. (Let’s give it to them.)

Exception:
This rule only applies when attaching two object pronouns to the "nosotros" imperative. If there are no pronouns or only one pronoun, the "-s" remains.
Examples:

Mostremos respeto. (Let’s show respect.)
Mostremosle la carta. (Let’s show him/her the letter.)

In summary, when two pronouns are added to the "nosotros" imperative, such as "se" and "lo/la/los/las", the "-s" is dropped. This rule helps maintain smoother pronunciation in Spanish.
I hope this explanation has been useful to you.
Buen finde
Silvia