Which one of these sentences is  written correctly?: 

You should of asked me before borrowing my car, son! 

You should asking me before borrowing my car, son! 

You should have asked me before borrowing my car, son

You should be asking me before borrowing my car, son. 

The subjunctive mood is rarely used in English, but when using it correctly,  what should we say?:

Complete the sentence: I would have called you....

Which of the following verb forms indicates an obligation to do something: 

Another use of the subjunctive in English is when using conditional clauses to talk about what you would do If something else were possible. Complete this sentence correctly..... I would travel around the world...