The base form of the verb is the verb devoid of any inflections. For example : drink as opposed to drinks, drinking, drank and drunk. The base form is used .. 1. As the infinitive form: I heard him come in; We decided to go. 2. With imperative force : Stop that! Be quiet! Do not disturb. 3. For all persons of the present simple except the third person singular : I/You/We/They live over there. 4. With mandative subjunctive meaning : Is it essential that we be there?