Only use the definite article (“the”) when referring to specific items; for singular, non-specific items use “a”.
2. Word confusion:
Although they sound similar, don’t confuse “instant” with “instance”. The meanings are quite different.
3. Passive form:
While “hard being convinced” seems to be a passive construction, the form is incorrect. The word “hard” needs to be introduced by “was” and followed by an infinitive (“was hard to convince”).
4. Verb form:
After a modal verb, use the base form of the verb (“like” not “likes”).
The infinitive is formed from “to” + the base form of the verb. There is no “s” or any other verb ending on an infinitive, so use “to think” not “to thinks”.
6. Pronoun agreement:
It makes more sense if you change “his” to “her”. “His” is possible here, but it doesn't make as much sense.
7. Word form:
The word “corrected” is a past participial adjective. Here, however, a comparison is needed (i.e., something like “more correct”). A good solution would be to change this expression to “better”.
8. Word confusion:
The words “then” and “than” sound very similar, but they are quite different. Here, we need “than” because there is an implicit comparison.
In this case, the “view” belongs to someone (i.e., “anyone else”), so it needs to be possessive (“anyone else’s”).
The first independent clause ends with “convince”, so a semicolon is needed here.
It is clear that the pronoun “she” refers to a person, so restating the fact is unnecessary. Instead of “she is a person who is”, we can simply say “she is”.
As a matter of fact, she is hard to convince; for instance, she certainly likes to think that her opinion is better than anyone else’s.