Look at the picture and use the prompts to write sentences. Use the correct form of the present perfect simple

Look at the picture and use the prompts to write sentences. Use the correct form of the present perfect simple
1. Lesson/ not/ start/ yet
2. Teacher/ already/ write/ on the board
3. Joe and Tim/ just/ come/ into the classroom
4. Tony/ not/ finished/ getting/ books ready
5. Christine/ already/ open / book 
6. Dave/ drop/ pen/ on the floor
7. He/not/ pick it up/ yet
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