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Hello Ariel!

Thank you for doing your homework. :)

I understand that English could be really difficult.

But it only takes faith and confidence in yourself to perfect it.

You are a smart person and I know that with constant practice you will do great… ^_^

Xoxo,

T. Christina ^^

Here are my corrections for you:

I think competition is good. Because it motivates people to work harder. 

>> I think competition is good because it motivates people to work harder. 

And they can feel a sense of accomplishment when they win the competition.

>> They can feel a sense of accomplishment when they win the competition.