A teacher is having fun with her students. She has created numerous sentences that are ridiculous in their 'meaning.' She has asked her students to tell her which of the sentences are possible in English, regardless of how odd the meaning is, and which sentences cannot make any sense whatsoever. An example of one of these possible sentences is: The grandfather clock and my grandmother are secretly in love. An impossible sentence might be: The shy giggling would not choo-choo the quickly goose. What is the teacher using the assignment to evaluate?