devoir 4 cned anglais

Sujet du devoir

Expression écrite
You have decided to enter a competition in which you have to present a new invention that
you think would be useful to many people. Write a report dealing with the aspects suggested
below. (200 words)

a) How the idea came to you.
b) What items already exist on the market and why they are not satisfactory.
c) Your invention: description, materials used, size, function, how it works etc...
d) How it would improve things for people (advantages).
e) In terms of cost, how expensive it could be to produce.

Où j'en suis dans mon devoir

Alors j'ai déja rédigé mon devoir, j'ai choisi un manteau-tente. Le truc, c'est que je fais beaucoup de fautes grammatical et j'aurais besoin d'avoir une correction. Merci d'avance!