Mention three forms of subjunctive with 3 examples

1. Counterfactual
In this subjunctive construction, the writer expresses a notion contrary to fact, such as “If I were you, I’d return it to the store.”

2. Imperative
In this class of the subjunctive mood, commands and demands are expressed: “I demanded that she walk away.”

3. Necessity
This subjunctive form refers to requirement: “It is necessary that she fill out the form first.”