When a sentence uses
the subject of the sentence performs the action of the verb.

Show his work so he doesn’t get points taken off. this is because even if he can do calculations in his head, he may make a mistake and having it on the paper will not only him find mistakes but show that he was doing the work as well.

Acquiring english is a way of learning where you learn english by birth, this includes listening to your parents, brothers and sisters and on the whole learning it from the environment around you while mastering standard english need qualified institutes and teachers who make certain programs and syllabus to you master the standard english. this also can include a long session of academic studies before you can master the standard english.standard english is necessary for literary works, official usage and writing materials for standardized publications or when someone needs to speak publicly. in most cases the employers of a company also demand and like the use of standard english from their employees.