A statement is given followed by two assumptions

Solution

(I) Essays cannot be written without complete mastery over the subject. The statement mentions that understanding of the subject is required, but it does not say that complete mastery is necessary. One can write a good essay with a reasonable understanding of the subject, even without complete mastery. This assumption is not implicit. (II) Anyone with a good command over the language can write a good essay. The statement clearly mentions that both an understanding of the subject and a command over the language are required. This means that just having a good command over the language is not enough to write a good essay. This assumption is also not implicit.