Mastering Spanish Formal Commands: Get it Right!

Is the following formal command grammatical in Spanish?

No digues mentiras.

Final answer:

The given formal command "No digues mentiras" is not grammatical in Spanish. The correct form should be "No digas mentiras." The formal command form of the verb "decir" (to say) is "diga" for singular and "digan" for plural.

Explanation:

The given formal command "No digues mentiras" is not grammatical in Spanish. The correct form should be "No digas mentiras." In Spanish, the formal command form of the verb "decir" (to say) is "diga" for the singular and "digan" for the plural. Therefore, the correct formal command would be "No diga mentiras" for singular and "No digan mentiras" for plural.