Look at the groups of words below. Do you know Which are sentences and which are not? Put a checkmark in the space next to sentences, and an \( x \) next to other word groups. 1 Mrs. Chen is a good teacher 2 not well today \( \square \) 3 Do the work yourself. 4 How are you? \( \square \) 5 basic rules of grammar 6 bread and butter 7 Welcome to the National Zoo. \( \square \) 8 brush his teeth 9 toys in the box 10 more than one 11 What is the time now? 12 Sit down! 13 Please come here.

Let's analyze each group of words to determine which are complete sentences and which are not. 1. Mrs. Chen is a good teacher. \( \checkmark \) 2. not well today \( x \) 3. Do the work yourself. \( \checkmark \) 4. How are you? \( \checkmark \) 5. basic rules of grammar \( x \) 6. bread and butter \( x \) 7. Welcome to the National Zoo. \( \checkmark \) 8. brush his teeth \( x \) 9. toys in the box \( x \) 10. more than one \( x \) 11. What is the time now? \( \checkmark \) 12. Sit down! \( \checkmark \) 13. Please come here. \( \checkmark \) Here’s the summary: 1. Mrs. Chen is a good teacher. \( \checkmark \) 2. not well today \( x \) 3. Do the work yourself. \( \checkmark \) 4. How are you? \( \checkmark \) 5. basic rules of grammar \( x \) 6. bread and butter \( x \) 7. Welcome to the National Zoo. \( \checkmark \) 8. brush his teeth \( x \) 9. toys in the box \( x \) 10. more than one \( x \) 11. What is the time now? \( \checkmark \) 12. Sit down! \( \checkmark \) 13. Please come here. \( \checkmark \)