Did you finish it on time? You write very well. However, I have a few details to share:
how a person can have the best understanding of a car if hedoesn't see a car before
a person will listen to other ones' talking, which will in turn have contributions to his speaking ability.
The boldface words can be categorized as the faulty reference of a pronoun. Also, you'd better avoid a contracted form (see the red one)
the more books an individual readS ,
a subject-verb agreement
In my opinion ( a comma) they are equally important and helpful.