In simple sentences, the synthetic forms of the Subjunctive Mood are more frequent than the analytical forms. In simple sentences the Subjunctive Mood is used:

#1. to express a wish:

Long live the Faithful People!
Success attend you!

То express wish the analytical subjunctive with the mood auxiliary may is also used.

May success attend you!
May you live long and die happy!

#2. to express an unreal wish:

If only he were free! (Galsworthy)

#3. in oaths and imprecations:

Manners be hanged!
Confound these flies!

#4. in some expressions:

Suffice it to say that…
Be it so!
God forbid!
Far be it from me.

The Subjunctive Mood in simple sentences is characteristic of literary style, except in oaths and imprecations, which belong to a low colloquial style.