¡Seamos saludables ahora!
Supposed to say "Get healthy now!" presumably "Let's get healthy now!".
Sea saludable ahora - I (will) get healthy now (command to me, can you even do this give yourself a command?)
Sé saludable ahora - You (will) get healthy now.
Sea saludable ahora - Usted / He / She (will) get healthy now. (but only usted can receive this as a command)
¡Seamos saludables ahora! We (will) get healthy now. OR (Let's get healthy now)
Seems like a weird command. The command form shares the let's form, doesn't it? So in essence let's IS a command because you being included making it let's changes out of command form and into let's form.
Mira eso - Look at that. (you)
Mire eso - Look at that (usted / he / she) but only usted form can be command, because you can't command a third person.
Miremos eso - Let's look at that. The command is to all of us and therefore no command, just let's.
Only the we form can do let's.
Sigh. Just thinking out loud. I prefer to air my thoughts, lest they be incorrect and go uncorrected. I know this is first grader stuff but I'm just doing a brief review.
Gracias.
2 Answers
"Sea" - in contexts like this, should be taken more as encouragement than a strict command.
Sea / se bueno: be good
Sea millonario: Be a millionaire!
Sea exitoso: be successful
Sea feliz y admirado: be happy and admired
By contrast:
¡Sea fuerte, no llore! - Be strong, don't cry!
¡Sea valiente, déjese de mariqueras! (not very nice, I know, but people do say things like this) - Be brave and drop the girlie act!
Languages change rather significantly within 30-70 years, so I cannot predict the future, and especially when these changes are regional.
But I can tell you that in Spain, as today, your suggestions sound rather strange (but not wrong). I would go for something like "Siga/tenga una vida sana" or something like that. But these suggestions change quickly over time.
