Shortest comprehensive sentence in English [closed]

"Go."

The understood subject is "You". "[You] go" makes sense to me.

One could argue that in certain contexts, the single letter "I" is a sentence (depending on your definition of a sentence):

"Who is it?"

"I"

This (one letter) is the shortest possible, unless you count the "empty utterance". ;-)

It is said both the longest and the shortest sentence comes from the wedding ceremony:

I do.

"Be!"

The verb "to be" in the imperative mood. Though it's the same number of letters as "Go!", I'd say it wins as it comes first alphabetically. ;)

"No!" works perfectly, in my opinion.