Hello, fellas. In this session we will learn how to use the subjunctive in noun clauses.
Sentences using the subjunctive usually carry the meaning of importance or urgency. A subjunctive verb only uses the simple form of a verb. There is no present, past, or future form in the subjunctive. Its verb is neither singular nor plural. A subjunctive verb is used in noun clauses with that following certain verbs and expressions.
Verbs and expressions followed by the subjunctive in noun clauses:
it is essential
it is imperative
it is important
it is critical
it is necessary
it is vital
1) She demands that I be on time.
2) The teacher insisted that we do the homework.
3) He recommended that they (should) not go to the stadium.
(Should is also possible after recommend and suggest)
4) It is necessary that she be forgiven.
(Passive: simple form of be + past participle)
5) I suggested that they (should) make a decision immediately.
Betty Schrampfer Azar, Understanding and Using English Grammar: Third Edition