Cheating on the test was a big mistake. (Start with "I")
I should not have cheated on the test.
Gabriel's handwriting is so amazing! (Use "such")
Gabriel has such an amazing handwriting!
In my family, there's no better dancer than me. (Use "best")
In my family, I dance the best.
If you don't drink water, you'll have a headache. (Use " 'd better")
You'd better drink water or you'll have a headache.
They did not give him permission to leave school early. (Start with "He'")
He was not allowed to leave school early.
Guilherme is better at soccer than Duda. (Use "as")
Duda doesn't play soccer as well as Guilherme.
You are too younger to drink. (Use "enough)
You are not old enough to drink.
It's so cold I can't go outside. (Use "too")
It's too cold to go outside.