[Nefertiti]

Hi, Anglika.

"You' is omitted. Correct? No - it is a command/request: "Do this". If punctuation was always properly included in texts of poems and songs, they would be much more easily understood!

A sentence must have a subject. A basic form of a sentence is a subject + a verb. (i.e. S + V)

When you say, "Do this." I think the subject must be 'YOU', but it's omitted.
For instance, come here, go there, don't cry, come in, fire...etc.

Don't you think so?

Thanks for your explanations on brothers and sisters.