Let's guess the concepts

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Across
  1. 4. Affirmative contraction for first person singular
  2. 6. Sentence where it is tell that something does not exist or is not happening
  3. 8. Form of the verb to be for the pronoun "we" in the negative
  4. 10. In the negative sentence where the auxiliary is placed with respect to the verb
Down
  1. 1. Sentence that makes a statement
  2. 2. Types of verbs used in negative sentences
  3. 3. Part of sentence
  4. 5. Part of sentence that indicates what the subject does
  5. 7. Group of words that expresses a complete thought
  6. 9. What particle is added to verb to be to form a negative sentence?