The subjunctive mood is used to express a wish or possibility. This mood has a limited role
in English compared to other languages such as French or Italian, but it's important to use it
properly in formal writing.
The subjunctive form of a verb (apart from to be ) is made from the 3rd person present
singular, without the -s (or -es ) ending. With these verbs, the same forms are used whether or
not the context is the present or the past.
The subjunctive is typically found in rather formal English constructions with that and
with verbs such as suggest, demand, insist, ask, recommend , etc.:
It was suggested that he wait till the next morning.
They demanded that the prime minister explain who authorized the action