Some parents often say "Studying is very easy!"
But studying isn't a piece of cake.
When we make mistakes, we get in deep trouble. It's not very not good.
But we must study to be one step closer to our goals. Until now, I am studing.

Explanation: Studying in the sentence serves as the subject. Study is a verb, thus it is not correct if used. For mistakes, we may use the verb make, have, commit or get depending on what you mean.

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