Yes, it is possible, but only in imperatives and certain subjunctives:
(1) "Bring your own food". (Imperative)
(2) "God bless you". (subjunctive)
Example (1) is an imperative sentence. The verb "bring" is an infinitive verb-form and is therefore non-tensed, but the sentence is nevertheless grammatically fine.
Subjunctives occur mainly in subordinate clauses; in main clauses they are restricted to a few fixed expressions like (2) and "So be it"; "Long live the King" and so on.