sentence: However , you will have to spend a considerable amount of money on it and you will not be guaranteed to achieve your goals at all , so it could become a real nightmare if you do not focus on your learning tasks .
modified: However , you will have to spend a considerable amount of money in it and you will not be assured to achieve your goals at all so it would be able to become a real nightmare if you are not focus on your learning tasks .
transformation: PREP, VERB, PUNCT, OTHER, VERB:TENSE